Wiki source code of OTA Update Firmware/Configure for Sensors

Version 86.4 by Mengting Qiu on 2025/06/17 09:10

version	line-number	content
8.1	1	Table of Contents:
	2
	3	{{toc/}}
	4
	5
11.2	6
10.2	7	= 1. Overview =
1.1	8
10.2	9
23.1	10	There are some new models of Dragino sensors support OTA update via Private LoRa Protocol, (Even the sensor runs LoRaWAN protocol by default).
1.1	11
23.1	12	User can use the OTA update to update the configure file or firmware to the sensors.
1.1	13
23.1	14
10.2	15	= 2. Support Models =
	16
	17
1.1	18	Here list the models that support OTA Update.
	19
	20	{{velocity}}
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32.2	25	(% border="1" cellspacing="5" class="doOddEven filterable grid sortable" id="tableid" style="background-color:#ffffff; width:670px" %)
	26	(% class="sortHeader" %)\|=(% style="width: 258px; background-color: rgb(217, 226, 243);" %)Models\|=(% style="width: 158px; background-color: rgb(217, 226, 243);" %)Firmware Version\|=(% style="width: 251px;background-color:#D9E2F3" %)Comments
	27	\|(% style="width:258px" %)RS485-LB/LS\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	28	\|(% style="width:258px" %)SN50v3-LB\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	29	\|(% style="width:258px" %)PS-LB-NA\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	30	\|(% style="width:258px" %)TS01-LB/LS\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	31	\|(% style="width:258px" %)CS01-LB\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	32	\|(% style="width:258px" %)AIS01-LB\|(% style="width:158px" %)All firmware version\|(% style="width:251px" %)
	33	\|(% style="width:258px" %)TC01-LB/ TC11-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	34	\|(% style="width:258px" %)LHT65N\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	35	\|(% style="width:258px" %)LHT65N-PIR,LHT65N-E31F\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	36	\|(% style="width:258px" %)D20-LB/D20S-LB/D22-LB/D23-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	37	\|(% style="width:258px" %)S31/S31B-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	38	\|(% style="width:258px" %)AQS01-L\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	39	\|(% style="width:258px" %)UV254-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	40	\|(% style="width:258px" %)SDI-12-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	41	\|(% style="width:258px" %)SE01-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	42	\|(% style="width:258px" %)PS-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	43	\|(% style="width:258px" %)SE02-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	44	\|(% style="width:258px" %)SPH01-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	45	\|(% style="width:258px" %)LMS01-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	46	\|(% style="width:258px" %)WL03A-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	47	\|(% style="width:258px" %)DS03A-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	48	\|(% style="width:258px" %)CPL03-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	49	\|(% style="width:258px" %)SW3L-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	50	\|(% style="width:258px" %)LCC01-LB\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	51	\|(% style="width:258px" %)PS-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	52	\|(% style="width:258px" %)LDS12-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	53	\|(% style="width:258px" %)LDS40-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	54	\|(% style="width:258px" %)DDS75-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	55	\|(% style="width:258px" %)DDS45-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	56	\|(% style="width:258px" %)DDS20-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	57	\|(% style="width:258px" %)DDS04-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	58	\|(% style="width:258px" %)MDS120-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	59	\|(% style="width:258px" %)MDS200-LB/LS\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
	60	\|(% style="width:258px" %)DS20L\|(% style="width:158px" %)All Firmware Version\|(% style="width:251px" %)
2.1	61
10.2	62	= 3. How to do OTA update =
	63
	64	== 3.1 Required Components ==
	65
83.1	66	* See FAQ 4.4 for how to update LA66 with the [[OTA Dongle Firmware>>https://www.dropbox.com/scl/fo/ztlw35a9xbkomu71u31im/ALF3WtzilGPi-2nOdtQw1Z4/Utility/Sensor%20Manager%20Utility/OTA_Firmware?rlkey=ojjcsw927eaow01dgooldq3nu&e=1&subfolder_nav_tracking=1&dl=0]].
86.3	67	* Click this link to view how to use the computer version upgrade tool to burn the OTA_DONGLE firmware for LA66.
86.4	68	* Software: [[OTA_Tool>>https://www.dropbox.com/scl/fo/9kqeqf6wmet10o9hgxuwa/h?rlkey=4ikrg6kg5v0yjxwhp0i37wrv7&dl=0]].
7.1	69
86.4	70
	71
16.1	72	[[image:image-20230513120722-2.png\|\|height="409" width="866"]]
7.1	73
14.1	74
57.1	75	== 3.2 OTA Update Firmware via Mobile Phone + LA66 ==
10.2	76
75.1	77	=== 3.2.1 LA66 upgrade ===
10.2	78
75.1	79	The LA66 USB connects to the phone via the USB-Type C adapter.
57.1	80
82.1	81	[[image:image-20250219103117-5.jpeg\|\|height="289" width="718"]]
70.2	82
	83
75.1	84	After the connection is successful, the phone will pop up a prompt box, check it, and click to "OK".
70.2	85
78.1	86	(% style="color:red" %)Note: (%%)Some mobile phone models need to manually enable the OTG function to properly identify external devices.
70.2	87
75.1	88	[[image:image-20250214162012-8.png]]
70.2	89
	90
	91	(% class="wikigeneratedid" id="H-1" %)
70.4	92	Then, the Device Tool will automatically jump to the main interface of the tool.
70.2	93
	94	(% class="wikigeneratedid" %)
75.1	95	In the upper left corner of the main interface of the software, click (% _mstmutation="1" style="color:blue" %)"Upgrade Device"(%%) and select the "(% _mstmutation="1" style="color:blue" %)LaA66"(%%) type.
70.2	96
	97	(% class="wikigeneratedid" %)
75.1	98	[[image:image-20250219095423-2.png]]
70.2	99
	100	(% class="wikigeneratedid" %)
75.1	101	Follow the steps in order:
70.2	102
	103	(% class="wikigeneratedid" %)
75.1	104	① Click "SELECT UPGRADE FILE" to choose the firmware to upgrade.
70.2	105
	106	(% class="wikigeneratedid" %)
75.1	107	② After clicking Start, wait for the LA66 to burn in
70.2	108
	109	(% class="wikigeneratedid" %)
75.1	110	[[image:image-20250214162029-9.png]]
70.2	111
	112	(% class="wikigeneratedid" %)
70.5	113	(% style="color:red" %)Note:
70.2	114
	115	(% class="wikigeneratedid" %)
75.1	116	~1. In order to ensure that the LA66 USB works properly, make sure that there is a corresponding bootloader before updating the firmware.
70.2	117
70.5	118	(% class="wikigeneratedid" %)
75.1	119	2. If you don't have a bootloader, you need to use the "[[Tremo Programmer>>https://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H3.1.3Howtouploadbootloadertodevice3F]]" software to download it. Click to get [[bootlooder>>url:https://wiki.dragino.com/xwiki/bin/download/Main/BLE%20Bluetooth%20Remote%20Configure/WebHome/LoRa_OTA_Bootloader_v1.4.bin?rev=1.1]], then refer to this [[link>>https://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20USB%20LoRaWAN%20Adapter%20User%20Manual/#H1.10.2Updatemethod:A0ForLA66withoutbootloader]] for instructions to burn.
70.5	120
70.2	121
75.1	122	When the upgrade is complete, it will prompt:"update successfully".
70.2	123
78.1	124	[[image:image-20250219100549-3.png\|\|height="484" width="362"]]
70.2	125
	126
75.1	127	=== 3.2.2 LB series ===
70.2	128
75.1	129	* Upgrade of external tools: LA66 USB
	130	[[image:image-20250214161740-1.png]][[image:image-20250214161758-2.png]]
	131	* Before using LA66 as a firmware burning tool for -LB products, you need to burn OTA_DONGLE for LA66 first.
78.1	132	* Click to get [[OTA_DONGLE V1.1.>>https://www.dropbox.com/scl/fo/ztlw35a9xbkomu71u31im/ALF3WtzilGPi-2nOdtQw1Z4/Utility/Sensor%20Manager%20Utility/OTA_Firmware?dl=0&rlkey=ojjcsw927eaow01dgooldq3nu&subfolder_nav_tracking=1]]
70.2	133
75.1	134	[[image:image-20250219094223-1.png\|\|height="324" width="698"]]
70.2	135
78.1	136	* Refer to [[Section 3.2.1>>\|\|anchor="H3.2.1LA66upgrade"]] to burn OTA DONGLEV1.1 for LA66.
70.2	137
75.1	138	The LA66 USB connects to the phone via the USB-Type c adapter.
70.2	139
82.1	140	[[image:image-20250219103130-6.jpeg\|\|height="301" width="747"]]
70.2	141
	142
75.1	143	After the connection is successful, the phone will pop up a prompt box, check it and click to confirm.
70.2	144
75.1	145	(% style="color:red" %)Note:(%%)Some models of cell phones require the OTG function of the cell phone system to be enabled manually in order to recognize the external device correctly.
70.2	146
75.1	147	[[image:image-20250214161907-4.png]]
	148
	149
70.2	150	(% class="wikigeneratedid" id="H-1" %)
70.5	151	Then, the Device Tool will automatically jump to the main interface of the tool.
70.2	152
	153	(% class="wikigeneratedid" %)
75.1	154	In the upper left corner of the main interface of the software, click (% _mstmutation="1" style="color:blue" %)"Upgrade Device"(%%) and select the LB type.
70.5	155
	156	(% class="wikigeneratedid" %)
78.1	157	[[image:image-20250219100821-4.png]]
	158
	159
	160	(% class="wikigeneratedid" %)
70.2	161	Follow the steps in order:
	162
	163	(% class="wikigeneratedid" %)
78.1	164	① Enter the DUIEI,.
70.2	165
	166	(% class="wikigeneratedid" %)
78.1	167	② Enter the PIN (the PIN is the last 8 bytes of APPSKEY, It's 16 characters in total).
70.2	168
	169	(% class="wikigeneratedid" %)
78.1	170	③ Select the LoRa frequency to match the original frequency of the node.
70.2	171
	172	(% class="wikigeneratedid" %)
75.1	173	④ Choose the upgrade file,(% style="color:red" %)(The firmware upgrade file format only supports .bin files)
70.2	174
	175	(% class="wikigeneratedid" %)
78.1	176	⑤ Press the reset button of the device to be upgraded and click "Start".
70.2	177
70.5	178	(% class="wikigeneratedid" %)
75.1	179	(% style="color:red" %)Note:
70.2	180
	181	(% class="wikigeneratedid" %)
78.1	182	~1. If you are unable to access the upgrade for an extended period of time, you can perform the device reset step again.
70.2	183
75.1	184	(% class="wikigeneratedid" %)
78.1	185	2. If you do not want to open the cover of the device to be upgraded, you can hold down the ACT key for 5s until the device blinks green. This action is the equivalent of pressing the reset button.
70.5	186
75.1	187	[[image:image-20250214161928-5.png]]
70.5	188
70.2	189
75.1	190	(% class="wikigeneratedid" id="H-2" %)
	191	When the upgrade is complete, it will prompt:"update successfully".
70.2	192
75.1	193	[[image:image-20250214161941-6.png]]
70.2	194
75.1	195
57.1	196	== 3.3 OTA Update Firmware via PC ==
	197
	198
21.1	199	(% class="wikigeneratedid" %)
24.1	200	(% class="mark text-uppercase" %)Video Instruction:(%%) ~-~- OTA Upgrade Firmware (via LoRa) of LoRaWAN Sensors: [[https:~~/~~/youtu.be/SSvOqvBrwGg>>https://youtu.be/SSvOqvBrwGg]]
21.1	201
	202
30.1	203	=== (% style="color:blue" %)Step1:(%%) Plug LA66 USB to PC and run OTA_Tool. ===
10.2	204
	205
40.1	206	[[image:image-20250121091115-1.png]]
7.1	207
	208
10.2	209	=== (% style="color:blue" %)Step2:(%%) Set up OTA Tool ===
7.1	210
	211
27.1	212	* (% style="color:blue" %)DevEUI(%%): Input DevEUI of your sensor
10.2	213
56.1	214	* (% style="color:blue" %)Password(%%): Passord of your sensor(Last eight bytes/ Last 16 characters of APPSKEY)
10.2	215
	216	* (% style="color:blue" %)Port(%%): Com port of LA66 USB
	217
	218	* (% style="color:blue" %)LoRa_Freq(%%): Choose the shipped frequency band of your sensor.
	219
	220	* (% style="color:blue" %)Upload_File(%%): The firmware to be upload to the sensor. make sure the firmware is with surfix _without_bootloader. For example: LHT65N_EU868_v1.5_without_bootloader.
	221
45.1	222	* (% style="color:blue" %)DEUI_File(%%): If customer has lots of sensors. He can also import the Dev EUI files and use droplist to choose the sensor to update. (If you did not ask us for a uniform update file, then you do not need to use this field, please ignore it.) Format is as below:
10.2	223
7.1	224	[[image:image-20230114174640-3.png\|\|height="130" width="1169"]]
	225
	226
84.1	227	=== (% style="color:blue" %)Step3:(%%) Click "Start" in the OTA tool. ===
7.1	228
84.1	229	Sometimes it takes a while after clicking "Start" for LA66 to start and broadcast the update process using the Dev EUI and password.
10.2	230
7.1	231
10.2	232	=== (% style="color:blue" %)Step4: (%%)Press reset button on the end node, or re-activate the end node. ===
7.1	233
40.1	234	When the OTA Tool displays “LA66 is scanning for sensor Dev EUI ‘(% style="color:blue" %)DevEUI(%%)’. Please reset the sensor for connection and update”, press and hold the ACT button on the terminal node for 5 seconds to perform a terminal node reset so that the OTA Tool can connect successfully.
10.2	235
40.1	236	[[image:image-20250121093705-3.png]]
	237
7.1	238	In every reboot/ reactivate, the end node will check if there is update request. If end node gets the update request from LA66. End node will check if the Dev EUI and Password match. If match, End node will establish connection with LA66 USB for OTA update.
	239
	240
10.2	241	=== (% style="color:blue" %)Step5:(%%) Check result. ===
7.1	242
10.2	243
7.1	244	Below shows the update successul result.
	245
40.1	246	[[image:image-20250121093834-4.png]]
7.1	247
	248
14.1	249	= 4. FAQ =
7.1	250
50.1	251	== 4.1 OTA_Tool supports two upgrade methods for -LB products. ==
14.1	252
	253
54.1	254	(% style="color:red" %)Note: The premise of using OTA_Tool is that all your devices have bootloaders.
20.2	255
54.1	256	(% style="color:red" %)1. (%%)Only devices with bootloader can perform OTA upgrades(OTA upgrade method).
	257
	258	(% style="color:red" %)2.(%%) This is because the boot loader's address is (% style="color:blue" %)0x08000000(%%), the general functional firmware's address is (% style="color:blue" %)0x0800D000(%%), and burning the firmware through OTA_Tool will only write content to the address (% style="color:blue" %)0x0800D000(%%). So whether you use the OTA_Tool's OTA upgrade method or the UART upgrade method, you can only use it to download firmware without a bootloader, otherwise you will incorrectly place the bootloader at address (% style="color:blue" %)0x08000000(%%).
	259
	260	* For OTA_Tool, you can choose to use the (% style="color:blue" %)OTA upgrade method(%%), refer to the above upgrade steps in this user manual.
	261
50.1	262	[[image:image-20250122104151-4.png\|\|height="318" width="673"]]
20.2	263
50.1	264	* Of course, if you have a USB-TTL adapter, you can also choose to use the [[UART upgrade method>>https://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H3.2UpdateFirmware28Assumethedevicealreadyhaveabootloader29]] via OTA_Tool.
20.2	265
50.1	266	[[image:image-20250122104131-3.png\|\|height="330" width="674"]]
20.2	267
	268
19.1	269	== 4.2 Where to find OTA Password? ==
	270
20.2	271
19.1	272	Each device has a shipped label with OTA Password which is 16 chars. like below. If user don't find this, please send us a photo for the device with Dev EUI to [[support@dragino.com>>mailto:support@dragino.com]] . and we will search the password for you.
	273
	274	[[image:image-20230519102907-2.png\|\|height="286" width="580"]]
	275
	276
20.1	277	== 4.3 How about if i upgrade a crashed firmware via OTA update? ==
19.1	278
20.1	279
20.2	280	OTA update is done via Bootloader and only change the firmware partition. So update a crash firmware via OTA update won't destroy bootloader and user can use OTA method to update again.
20.1	281
20.2	282	(% style="color:red" %)Here are notice:
20.1	283
20.2	284	~1. OTA update frequency depend on the firmware frequency. If there is no frequency in the firmware. Bootloader will use EU868 as default frequency.
20.1	285
20.2	286	2. OTA update require a reset or reactivate action. If the crash firmware doesn't have them work, user need to manuall push the physic reset button on the PCB or power off/on device.
	287
	288
53.1	289	== 4.4 How to update the LA66 OTA Dongle V1.1 via mobile phone? ==
35.1	290
53.1	291
	292	[[image:image-20250122113225-5.png\|\|height="259" width="615"]]
	293
	294	* If you have never downloaded LA66 OTA DongleV1.0 to your LA66, you can directly upgrade the LA66 OTA DongleV1.1 program from your phone using the following method.
	295
43.1	296	[[bootlooder>>url:https://wiki.dragino.com/xwiki/bin/download/Main/BLE%20Bluetooth%20Remote%20Configure/WebHome/LoRa_OTA_Bootloader_v1.4.bin?rev=1.1]] and [[OTA_firmware>>url:https://wiki.dragino.com/xwiki/bin/download/Main/BLE%20Bluetooth%20Remote%20Configure/WebHome/LA66%20OTA%20DONGLE%20v1.1.bin?rev=1.1]].
	297
42.1	298	Tool Download: [[Download link form Dropbox.>>https://www.dropbox.com/scl/fo/gyscmfn1s03oz3n8rif8w/AJW7JoMQsQ56dtlls2SNf9c?rlkey=3q2cxwriyzh26vuairx01yebc&st=be5jv92w&dl=0]]
41.1	299
79.1	300	Operation instructions: [[Reference for operating procedures.>>\|\|anchor="H3.2.1LA66upgrade"]]
41.1	301
53.1	302	* If you have burned LA66 OTA DONGLE V1.0 for your LA66 according to previously existing instructions. Then you need to re-burn your LA66 boot loader first: [[LA66 USB LoRaWAN Adapter User Manual - DRAGINO>>url:https://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20USB%20LoRaWAN%20Adapter%20User%20Manual/#H1.10.2Updatemethod:A0ForLA66withoutbootloader]]
50.1	303
53.1	304	Please refer to FAQ 4.7 for detailed reasons.
50.1	305
53.1	306
41.1	307	== 4.5 Will OTA update effect the Local LoRaWAN Network. ==
	308
35.1	309	User can configure the OTA_Frequency.txt file to change the Update frequency point so it won't conflict with the general LoRa Frequency. See below for the file as reference and explain. The OTA update also use a none-use SF (SF=5) which won't conflict with the current use SF.
	310
	311	(% class="mark" %)#Define the OTA frequency use for OTA.
	312	#End Node has FRE1 and SF=5. So don't change FRE1 settings
	313	#FRE2 include several frequencies point.
	314	#PC first use FRE1 to create connection to end node, then use one of FRE2 frequencies to process downlink.
	315
	316	(% class="mark" %)#Format:
	317	#Frequency Band;FRE1;FRE2
	318	EU868;869.0;868.7,868.9
	319	IN865;866.9;865.1,865.3
	320	KZ865;866.5;866.1,866.3
	321	KR920;921.7;921.3,921.5
	322	MA869;870.5;870.7,870.9
	323	US915;923.1;923.7,924.1
	324	CN470;505.5;605.7,505.9
	325	AU915;923.7;924.7,925.5
	326	AS923;923.5;923.3,923.7
	327	AS923-2;921.2;921.8,922.0
	328	AS923-3;916.4;917.0,917.2
	329	AS923-4;917.1;917.6,917.8
	330	EU433;434.5;433.9,434.1
	331	RU864;869.3;869.5,869.7
	332
	333
50.1	334	== 4.6 The old version LA66 is different from the new version LA66. Can OTA_Tool be used for both versions? ==
	335
	336
	337	The most obvious hardware difference between LA66 V1 and LA66v2 when burning is the presence of a "RESET "button, and the RESET operation is only for LA66 without a boot loader, you can refer to this link to learn how to upgrade LA66 without a boot loader：[[LA66 USB LoRaWAN Adapter User Manual - DRAGINO>>url:https://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20USB%20LoRaWAN%20Adapter%20User%20Manual/#H1.10.2Updatemethod:A0ForLA66withoutbootloader]]
	338
52.1	339	[[image:image-20250122134752-6.png\|\|height="288" width="543"]]
	340
50.1	341	In summary, as long as your LA66 has a boot loader, either LA66 V1 or LA66 V2 can use OTA_Tool.
	342
	343
	344	== 4.7 Why can't LA66 burn its own working firmware after it is used for OTA upgrade of -LB products? ==
	345
	346
	347	We are sorry for the inadequacy of LA66 for OTA updates in the past.
	348
	349	* In the past, the download address of LA66 OTA DONGLE V1.0 was (% style="color:blue" %)0x08000000(%%), and the address of the bootloader that existed by default when the LA66 was shipped was also (% style="color:blue" %)0x08000000(%%).
	350
	351	Therefore, when you burn OTA_Firmwar v1.0 (LA66 OTA DONGLE v1.0) for the LA66 in order to use the LA66‘s ability to perform OTA upgrades for -LB products, the LA66’s bootloader is overridden.
	352
	353	So if you need to switch back to the LA66's working firmware, you'll need to refer to this [[link>>https://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LA66%20USB%20LoRaWAN%20Adapter%20User%20Manual/#H1.10.2Updatemethod:A0ForLA66withoutbootloader]] for instructions to burn firmware with a bootloader for the LA66.
	354
	355	[[image:image-20250122113225-5.png\|\|height="336" width="798"]]
	356
	357	* For the new version of LA66 OTA DONGLE V1.1, we have changed the supported download address to (% style="color:blue" %)0x0800D000(%%) the same as other working firmware addresses, so you can simply use OTA_Tool to burn LA66 OTA DONGLE V1.1 and LA66 working firmware for LA66.
	358
14.1	359	= 5. OTA Tool Known Bug: =
	360
	361
10.2	362	~1. If user click "(% style="color:blue" %)Start"(%%) but there is issue during update. User may need to close and open the tool again.

Wiki source code of OTA Update Firmware/Configure for Sensors

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