most guides I found online are for windows based computers and those that even name linux are outdated.
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Linux distro I run: debian 12.5, adb and fastboot installed through apt
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Phone I want to experiment with: redmi 9c
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Firmware I’m installing: https://xdaforums.com/t/rom-13-unofficial-lineageos-20-0-unified-for-redmi-9a-9c-10a-blossom.4609367/
fastboot devices recognizes the device and I can also boot the phone to fastboot: it shows a black (not blank) screen with the word FASTBOOT printed orange.
I tried following https://android.gadgethacks.com/how-to/complete-guide-flashing-factory-images-android-using-fastboot-0175277/ but fastboot flashing unlock and fastboot oem unlock return FAILED (remote: 'Token Verify Failed, Reboot the device ')
developer options and OEM unlocking are both activated on the device
I’ve never used miui devices but I think you need to make an account and use this https://en.miui.com/unlock/download_en.html so you will probably need to have wine installed to run it, unless it has a native linux version in the zip file. Then you should have an unlocked bootloader