I tried the OTA update, but after it downloaded It displayed message that the package has error and need to re-install...I have done this many times now and still could not update the firmware. My model DDR4(S/N: B922X)
You can restore the factory settings in the settings, and then upgrade the wireless, because you are using the version 902P0, but our latest version is 906P0, so you need to upgrade several times to upgrade to the latest version, you can also upgrade to the latest through sd Version, please check the firmware and tutorial in the link for details.