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881	881	== 4.1 ​How to change the LoRa Frequency Bands/Region? ==
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883	883	You can follow the instructions for [[how to upgrade image>>||anchor="H2.10200BFirmwareChangeLog"]].
884	884	When downloading the images, choose the required image file for download. ​
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887	887	How to set up LSE01 to work in 8 channel mode By default, the frequency bands US915, AU915, CN470 work in 72 frequencies. Many gateways are 8 channel gateways, and in this case, the OTAA join time and uplink schedule is long and unpredictable while the end node is hopping in 72 frequencies.
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890	890	You can configure the end node to work in 8 channel mode by using the AT+CHE command. The 500kHz channels are always included for OTAA.
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893	893	For example, in **US915** band, the frequency table is as below. By default, the end node will use all channels (0~~71) for OTAA Join process. After the OTAA Join, the end node will use these all channels (0~~71) to send uplink packets.
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895	895	[[image:image-20220606154726-3.png]]
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897	897	When you use the TTN network, the US915 frequency bands use are:
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899	899	* 903.9 - SF7BW125 to SF10BW125
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906	906	* 905.3 - SF7BW125 to SF10BW125
907	907	* 904.6 - SF8BW500
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909	909	Because the end node is now hopping in 72 frequency, it makes it difficult for the devices to Join the TTN network and uplink data. To solve this issue, you can access the device via the AT commands and run:
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911	911	(% class="box infomessage" %)
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918	918	**ATZ**
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921	921	to set the end node to work in 8 channel mode. The device will work in Channel 8-15 & 64-71 for OTAA, and channel 8-15 for Uplink.
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924	924	The **AU915** band is similar. Below are the AU915 Uplink Channels.
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926	926	[[image:image-20220606154825-4.png]]
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