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3. If the firmware download fails, it replies the following message. In this
case, you have to send $ActUpgradeFW again to do it over.
$ActUpgradeFW,[Command S/N],FAIL,[RTC Time]&
(Note: Weak GSM signal or broken image file may cause download
problems. We recommend you to test and verify the firmware update
process before mass deployment.)
4. If the firmware update is successful, it replies the following information
after booting by the new firmware. All configuration will remain the same
and will not be affected by the new firmware.
$ActUpgradeFW,[Command S/N],DONE,<UnitID>,<IMEI>,<IMSI>,<HW
VER>,<FW VER>,<RTC>&
