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184	184	[[image:image-20220602102824-5.png||height="306" width="600"]]
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186	186
187		-
188	188	==== 2.  Press the RST switch once ====
189	189
190		-
191	191	[[image:image-20220602104701-12.png||height="285" width="600"]]
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193	193
194		-
195	195	==== 3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
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233	233	[[image:image-20220602104923-13.png]]
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237	237	(% class="wikigeneratedid" id="HThefollowingfigureappearstoprovethattheburningisinprogress" %)
238	238	(% style="color:blue" %)**5. Check update process**
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270	270	* AT Command via UART-TTL interface
271	271	* Firmware upgradable via UART interface
272	272
273		-
274		-
275	275	== 3.3  Specification ==
276	276
277	277	* CPU: 32-bit 48 MHz
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290	290	* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
291	291	* LoRa Rx current: <9 mA
292	292
293		-
294		-
295	295	== 3.4  Pin Mapping & LED ==
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