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1337	1337	[[image:1653358238933-385.png]]
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1339	1339	In PC, User needs to set (% style="color:#4f81bd" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console for LT. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**)(%%) to active it. As shown below:
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1341	1341	[[image:1653358355238-883.png]]
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1658	1658	Below shows the hardware connection for how to upload an image to the LT:
1659	1659	* [[image:1653359603330-121.png]]
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1661	1661	**Step1:** Download [[flash loader>>url:https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html]].
1662	1662	**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1663	1663	**Step3: **Open flashloader; choose the correct COM port to update.
1664	1664	**For LT-22222-L**:
1665	1665	Hold down the PRO button and then momentarily press the RST reset button and the **DO1 led** will change from OFF to ON. When **DO1 LED** is on, it means the device is in download mode.
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1667	1667	[[image:image-20220524103407-12.png]]
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1708	1708	[[image:1653360231087-571.png||height="401" width="727"]]
1709	1709	)))
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1711	1711	(% style="color:red" %)Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by TTN.
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1713	1713	(% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
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1715	1715	(% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1716	1716	(% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1717	1717	(% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
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1722	1722	(% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1723	1723	(% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1724	1724	(% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
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1726	1726	As shown in below:
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1728	1728	[[image:1653360498588-932.png||height="485" width="726"]]
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