It is possible to invalidate the grub bootloader by updating the BIOS Firmware?

Support
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Today i decided to update my Bios Firmware. When trying to boot Manjaro i was dropped back to the grub rescue command line with the message:

symbol ‘grub_calloc’ not found

In the end, i managed to use the grub menu from a live USB to load the EFI bootloader.
Once fired up i reinstalled grub with:

sudo grub-install

Now looking at the entries at boot i can see, beside the usual ‘UEFIos 860 EVO’, the new entry ‘Manjaro 860 EVO’. The latter is the one that works.
Now my question is: could a BIOS firmware update make the UEFI code stored on the drive obsolete, invalidating it and thus making it unbootable?

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Hello @Leprotto :wink:

Possible. My guess is here, since during the upgrade the whole EFI gets overwritten, it recreated the EFI entry wrong (the name changed) and therefore grub could not be loaded.

Myself i had never issues at my UEFIs.

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Every single time I update my BIOS I have to use Manjaro Live USB to restore GRUB.

After restoring from Manjaro Live USB I can boot normally, then I do another sudo update-grub from normal system to make sure entries are correct.

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Updating the firmware will not break grub.

What sometime happens is the firmware’s NVRAM holding the locations of the registered boot entries is overwritten.

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In my case what is sure is that I have no possibility to boot Manjaro at all after I update the BIOS. Not from the BIOS (UEFI) itself, not from the boot menu, nothing works.

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