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7	7	This instruction shows how to upgrade firmware for Dragino products base on STM32 solution. The upgrade can use 2 hardware connections: **UART upgrade** or **ST Link v2 upgrade**. Some models supports both methods and some only one of them.
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	9	+
9	9	= 2. Hardware Upgrade Method Support List =
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11	11	(% border="1" style="background-color:#ffffcc; color:green; width:891.222px" %)
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23	23	|(% style="width:444px" %)[[RS485-BL>>url:https://www.dragino.com/products/lora-lorawan-end-node/item/167-rs485-bl.html]], LDDS75,[[LLDS12>>url:https://www.dragino.com/products/distance-level-sensor/item/185-llds12.html]],LDDS20,[[LSE01>>https://www.dragino.com/products/agriculture-weather-station/item/159-lse01.html]],WSC1-L,GroPoint Air|(% style="width:239px" %)[[Hardware Connection Photo>>||anchor="H3.1.3RS485-BL2FLDDS752FLDDS202FLSE01"]]|(% style="width:204px" %)[[Hardware Connect Photo>>||anchor="H4.1.4RS485-BL2FLDDS752FLDDS202FLSE01"]]
24	24	|(% style="width:444px" %)[[LTC2>>url:https://www.dragino.com/products/temperature-humidity-sensor/item/170-ltc2.html]]|(% style="width:239px" %)×|(% style="width:204px" %)[[Hardware Connect Photo>>||anchor="H4.1.5LTC2"]]
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	27	+
26	26	= 3. UART Upgrade Guide =
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28	28	== 3.1 Hardware Connection ==
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132	132	(((
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134	134	The previous LSN50 firmware file is stored in github. If user use right click ~-~-> Save As to get the hex file. This error will happen. Now the LSN50 firmware file has been moved to [[LSN50 Firmware>>url:http://www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Firmware/]] to avoid this happen.
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135	135	)))
136	136	)))
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244	244	=== 4.3.1 ST-Link v2 can not detect the hardware ===
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246		-**Possible Issue 1:**
	250	+(% style="color:#4f81bd" %)**Possible Issue 1:**
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248	248	1. Make sure see the LED blink on the ST-Link and release the reset button during blinking.
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250		-**Possible Issue 2:**
	254	+(% style="color:#4f81bd" %)**Possible Issue 2:**
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252	252	1. There are different version ST-Link v2. The white one as below is the most stable and recommended one.
253	253	1. The white version ST-Link v2 such as below photo has different hardware version. The original one doesn’t have 3.3v on pin 1/2 and the clone one has 3.3v on pin 1/2. User has to short pin19 (VDD 3.3v) and pin 1/2 (TVCC) for the original one so pin 1/2 has 3.3v power. Otherwise, the original one might have problem to upload firmware to End Node.
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257	257	ST-Link upload issue
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259	259
260		-Possible Issue 3:
	264	+(% style="color:#4f81bd" %)**Possible Issue 3:**
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262	262	1. The ST-Link adapter has issue in the RESET pin. this happens for the LHT65 model where the update request use the reset pin of ST-Link.We see this issue happen in below ST-LINK.
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264		-[[image:https://wiki.dragino.com/images/a/a3/ST-LINK-troube_4.png||height="337" width="406"]]
	268	+[[image:image-20220526175708-22.png]]
265	265
266	266	(((
267	267	RESET pin not function
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321	321	**step2:**Click yes to upgrade successfully.
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323		-