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>As of January 2021 deleting SecureBoot keys and installing your own keys (for example by using KeyTool) will brick the device. This is a problem that is similar to one which has been reported on some other Lenovo laptops [0] and is likely due to a faulty firmware. If the device is stuck in a boot loop after replacing the SecureBoot keys, the only way to repair it is by replacing the mainboard of the device.

[0] https://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/BIOS-...

From https://wiki.archlinux.org/title/Lenovo_ThinkPad_T14/T14s_(I...




Does reflashing the BIOS EEPROM (via hardware clip) work? Or have they "secured" that out of the question too?


I'd be surprised if that's not one of the bits of firmware that's checked on boot. So yeah, probably not possible, and not possible to downgrade.


The goal is that it's secured as well; the bios image itself is measured into the TPM and pluton as part of secure boot.




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