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743		-= ​5.  FAQ =
	743	+= ​4. FAQ =
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745		-== 5.1 ​ How to Upgrade Firmware ==
	745	+== 4.1 ​How to change the LoRa Frequency Bands/Region? ==
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	747	+(((
	748	+You can follow the instructions for [[how to upgrade image>>||anchor="H2.10200BFirmwareChangeLog"]].
	749	+When downloading the images, choose the required image file for download. ​
	750	+)))
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748	748	(((
749		-User can upgrade the firmware for 1) bug fix, 2) new feature release.
	753	+
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753		-Please see this link for how to upgrade:  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H2.HardwareUpgradeMethodSupportList>>http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H2.HardwareUpgradeMethodSupportList]]
	757	+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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757		-Notice, NSE01 and LSE01 share the same mother board. They use the same connection and method to update.
	761	+
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	764	+(((
	765	+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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	772	+(((
	773	+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.
	774	+)))
	775	+
	776	+[[image:image-20220606154726-3.png]]
	777	+
	778	+
	779	+When you use the TTN network, the US915 frequency bands use are:
	780	+
	781	+* 903.9 - SF7BW125 to SF10BW125
	782	+* 904.1 - SF7BW125 to SF10BW125
	783	+* 904.3 - SF7BW125 to SF10BW125
	784	+* 904.5 - SF7BW125 to SF10BW125
	785	+* 904.7 - SF7BW125 to SF10BW125
	786	+* 904.9 - SF7BW125 to SF10BW125
	787	+* 905.1 - SF7BW125 to SF10BW125
	788	+* 905.3 - SF7BW125 to SF10BW125
	789	+* 904.6 - SF8BW500
	790	+
	791	+(((
	792	+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:
	793	+
	794	+* (% style="color:#037691" %)**AT+CHE=2**
	795	+* (% style="color:#037691" %)**ATZ**
	796	+)))
	797	+
	798	+(((
	799	+
	800	+
	801	+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.
	802	+)))
	803	+
	804	+(((
	805	+
	806	+)))
	807	+
	808	+(((
	809	+The **AU915** band is similar. Below are the AU915 Uplink Channels.
	810	+)))
	811	+
	812	+[[image:image-20220606154825-4.png]]
	813	+
	814	+
	815	+== 4.2 ​Can I calibrate LSE01 to different soil types? ==
	816	+
	817	+LSE01 is calibrated for saline-alkali soil and loamy soil. If users want to use it for other soil, they can calibrate the value in the IoT platform base on the value measured by saline-alkali soil and loamy soil. The formula can be found at [[this link>>https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/&file=Calibrate_to_other_Soil_20220605.pdf]].
	818	+
	819	+
765	765	= 5. Trouble Shooting =
766	766
767	767	== 5.1 ​Why I can't join TTN in US915 / AU915 bands? ==