For that machine, which has only Manjaro on, after updating grub, it’s recommended to sync the fallback EFI loader to avoid that lock.
sudo cp /boot/efi/EFI/Manjaro/grubx64.efi /boot/efi/EFI/boot/bootx64.efi
That’s why you had to change the boot order, so now it points to the updated grubx64.efi instead of bootx64.efi.
What changed for me after this update or the one before was something I don’t really use much. It had to re-set the graphics sensors for the third-party pages Graphics and some AMD/Radeon pages (in Plasma System Monitor).
Guess those went to “GPU 2” which is now listed extra, next to my onboard “GPU”…
sticky note ? Maybe here → ~/.local/share/plasma_notes
I copied the loader, then changed Bios back to original boot order.
Works great.
Thanks
Thanks for the Update! With the links and explanations provided for the grub reinstall in the “Known issues” sections everything went smoothly for my BIOS/MBR system and I also learned some things 