Hello, for the key, I had to buy it on techmesto (thanks to him for the tutorial)
regarding instructions :
Grab the June 2018 OTA file from here =>
https://android.googleapis.com/pack.../2a84fb0cddebb6ed79e18735740c7386ebd4be1f.zip
Download the full firmware for Nokia 6 =>
https://drive.google.com/open?id=1twEoVIImRHeFdJ6OQSG4tfkEvtrY_0uJ
Download and install the NOST Tool =>
https://forum.xda-developers.com/no...t-improved-version-ost-la-6-0-4-v0-4-t3875574
Download and install OST Tool =>
https://drive.google.com/open?id=1-iwfKu7PHygVV5Ok4_lSibCW4ATeFpBu
(about me, it solved the problem of unrecognized devices)
On your device, go into Settings -> About and find the Build Number and tap on it 7 times to enable developer settings. Press back and go into Developer Options and enable USB debugging.
Connect the phone to the usb port
Copy June 2018 OTA file to SD Card
You will need the platform-tools from the Android SDK on your computer ==>
https://developer.android.com/studio/releases/platform-tools
Or use Minimal ADB ==>
https://forum.xda-developers.com/showthread.php?t=2317790
On the computer, navigate to ADB’s folder and open a Command Prompt and type:
check if the device is detected correctly
If you see a “No Command” screen ==> Press and hold Power key and quickly press and release the Volume Up key
Select apply update from SD card and select the update file (June 2018 OTA)
When the update gives an error,
reboot to bootloader by selecting the option from
recovery mode
check if the device is detected correctly
Now use the unlock key to unlock. Do normal unlock and also critical unlock.
Code:
fastboot flash unlock UnlockFile.bin
(UnlockFile.bin = name of the dedication key you purchased and it's easier to place it in the same folder as platform-tools)
Code:
fastboot oem unlock-go
fastboot flash unlock UnlockFile.bin
fastboot flashing unlock_critical
fastboot reboot
If it doesn't reboot, open NOST and flash the full firmware (nb0)
Warning: the battery must be sufficiently charged for NOST