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39		-
40	40	= 3. UART Upgrade Guide =
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42	42	== 3.1 Hardware Connection ==
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75	75	* Connect JP2 jumper (Yellow one), so device is power on.
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77	77
78		-
79	79	== 3.2 Upgrade Steps ==
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81	81
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147	147	1. We see a case the FT232 USB TTL adapter has reliability issue with the PC USB chipset(Intel). In this case, even above, it still has serious reliability issue for uploading. If this happen, change a PC or change a USB to TTL adapter will solve.
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149	149
150		-
151	151	== 3.4 Flash Loader ~-~- Unable to Load data from this file ==
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202	202	* ST-LINK v2 SWDIO  <~-~->  Dupont white pin
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204	204
205		-
206	206	=== 4.1.3 LAQ4 ST-Link v2 Connection ===
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229	229	* ST-LINK (VDD 3.3v,pin19)  <~-~->  ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
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231	231
232		-
233	233	=== 4.1.5 LTC2 ===
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246	246	* ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO
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248	248
249		-
250	250	== 4.2 ST-Link Upgrade Guide ==
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270	270	* Case 2: If your board doesn't have reset pin connect to ST-Link, but has a reset button (for example: LGT92). Keep pushing the small reset button on LGT92 and then click the blue global “settings” button on ST-Link utility.
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273		-
274	274	[[image:image-20220526175243-19.png]]
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276	276	Click Global Icon
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302	302	1. Make sure see the LED blink on the ST-Link and release the reset button during blinking.
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304		-
305	305	(% style="color:#4f81bd" %)**Possible Issue 2:**
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307	307	1. There are different version ST-Link v2. The white one as below is the most stable and recommended one.
308	308	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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311	311	[[image:image-20220526175418-21.png]]
312	312
313	313	ST-Link upload issue
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318	318	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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320		-
321	321	[[image:image-20220526175708-22.png]]
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323	323	(((
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382	382	[[image:image-20220526180013-26.png]]
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384	384	(% style="color:blue" %)**step2: **(%%) Click yes to upgrade successfully.
	375	+
	376	+= 5.Firmware upgrade using STM32 Cubeprogramer =
	377	+
	378	+Step1:Enter the download interface
	379	+
	380	+[[image:image-20230222160658-1.png||height="479" width="827"]]
	381	+
	382	+
	383	+Step2: Connect serial port correctly and select UART
	384	+
	385	+[[image:image-20230222160847-2.png||height="481" width="830"]]
	386	+
	387	+
	388	+Step3:Select the file to download
	389	+
	390	+[[image:image-20230222160947-3.png||height="473" width="818"]]
	391	+
	392	+
	393	+Step4:Click to start programming, and wait for it to download to 100%, pop up a successful download box
	394	+
	395	+[[image:image-20230222161119-4.png||height="476" width="821"]]