Upgrade Notes:
1.Only firmware version V02.03.01.X can be upgraded to this firmware.
2.Firmware cannot be downgraded to lower version. E.g: V90 can not be downgraded to V53.
3.Please upgrade your device by cable connections.
4.Please unzip the file you downloaded and use the file ended with "bin" or "trx" to upgrade your device.
5.Do not power off the device when upgrading.
Release Notes:
1. Improve wireless stability.
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