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2	2
3	3	{{toc/}}
4	4
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5	5	= 1. Introduction =
6	6
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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25	25	|(% 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	27
	31	+
28	28	= 3. UART Upgrade Guide =
29	29
30	30	== 3.1 Hardware Connection ==
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57	57	* Put Switch SW1 to ISP position
58	58	* Connect JP2 jumper (Yellow one), so device is power on.
59	59
60		-
61	61	== 3.2 Upgrade Steps ==
62	62
63	63	(((
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122	122	1. If you use Windows10 system. Please change the flash loader to run in Windows7 compatibility mode.
123	123	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.
124	124
125		-
126	126	== 3.4 Flash Loader ~-~- Unable to Load data from this file ==
127	127
128	128	[[image:image-20220526174137-8.png]]
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166	166	* ST-LINK v2 SWCLK <~-~-> Dupont green pin
167	167	* ST-LINK v2 SWDIO <~-~-> Dupont white pin
168	168
169		-
170	170	=== 4.1.3 LAQ4 ST-Link v2 Connection ===
171	171
172	172	[[image:image-20220526174602-14.png||height="506" width="922"]]
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188	188	* ST-LINK v2 SWDIO <~-~-> SWDIO
189	189	* ST-LINK (VDD 3.3v,pin19) <~-~-> ST-LINK (TVCC ,pin1) a wire to connect two pins of ST-Link together.
190	190
191		-
192	192	=== 4.1.5 LTC2 ===
193	193
194	194	[[image:image-20220526175131-18.png]]
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202	202	* ST-LINK v2 SWCLK <~-~-> LTC2 SWCLK
203	203	* ST-LINK v2 SWDIO <~-~-> LTC2 SWDIO
204	204
205		-
206	206	== 4.2 ST-Link Upgrade Guide ==
207	207
208	208	(((