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Enable developer options
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Enable OEM Unlocking (OEM Unlock)
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Enable USB debugging mode
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Change default USB configuration, choose File Transfer (MTP)
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Install adb and fastboot (
sudo apt-get install android-tools-adb android-tools-fastboot
) -
Install nokia usb drive
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Connect your phone to your PC and approve all usb connection
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Type
adb devices
, then it will show the serial number -
Type
adb reboot bootloader
, then your devices will boot into fastboot mode -
Type
fastboot devices
, to make sure that your device still connected to your PC and it will show your phone serial number -
Type
fastboot oem key $(echo -n "YOUR_PHONE_SERIAL_NUMBER" | md5sum | tr [a-z] [A-Z])
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Type
fastboot flashing unlock
, your phone will ask you about unlocking bootloader -
Press vol up (yes)
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