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1293	1293	(% style="color:red" %)**Note:**
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1295		-(((
1296	1296	(% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1297	1297	2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1298	1298	3. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.
1299	1299	4. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5
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1302	1302	[[image:1654162478620-421.png]]
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1327	1327	[[image:1654162535040-878.png]]
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1330	1330	**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]].
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1334	1334	**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1335		-)))
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1338	1338	**Step3: **Open flashloader; choose the correct COM port to update.
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1341	1341	(((
1342	1342	(((
1343		-(((
1344	1344	(% style="color:blue" %) Hold down the PRO button and then momentarily press the RST reset button and the SYS led will change from OFF to ON, While SYS LED is RED ON, it means the RS485-LN is ready to be program.
1345	1345	)))
1346	1346	)))
1347		-)))
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1350	1350	[[image:image-20220602175818-12.png]]