Before installing the firmware, be sure to try to get into the Recovery (I have this method - I press the RESET button (RST) and hold the buttons on the front panel of the device until the buttons blink - I release the RESET button and immediately press the RESET button again for a short time 1-2 times ). IMPORTANT!! : You cannot change the firmware versions in the system partitions - System, Vendor, ODM and Product (this is due to the fact that in 10 android these sections are dynamic and protected by the android itself from changes)- otherwise you will have a BLACK SCREEN after reboot and you will have to go to RECOVERY and reinstall the firmware from there (you can without deleting the data). Recovery: just connect a keyboard on BACK SIDE USB it is important front side doesnt work connect via backside usb press ctrl+alt+del device will restart than rapidly pres i key while holding alt + printscreen pray god
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