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Installing firmware from file to Focus 3 using a USB cable

Zulu November

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I have a focus 3 offline firmware file 5.0.999.698. The file name is 2QA4IMG.zip and it is about 3Gb.
I know how to install the firmware by starting the headset into the bootloader (volume down + power button) but I'd like to know if there is a possibility to install this firmware using ADB or fastboot commands.

The problem is I have a lot of these headsets to flash with new firmware and it would make my work easier if I could trigger the firmware install using commands without having to navigate through bootloader UI in the headset.
I can upload the rom to the sdcard with the "adb push 2QA4IMG.zip /sdcard2" but how can I trigger the flashing process?


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