Firmware update on asahi

Firmware update.md

Firmware update

• boot into Linux
• edit /etc/fstab and comment out the line with /boot/efi
• reboot into macOS
• mount the EFI partition of your linux install with diskutil mount 'EFI - LINUX' or similar (check the correct name with diskutil list)
• copy the contents of this partition (using finder or cp) somewhere in macOS
• unmount the partition again with diskutil umount 'EFI - LINUX'
• wipe the APFS container (2.5 GB) using diskutil apfs deleteContainer disk0s3 !! double and triple check the device id !!
• wipe the EFI partition (500MB) using diskutil eraseVolume free free disk0s4
• you should now have 3 GB free between the macOS APFS container and the 'Linux Filesystem' with your rootfs
• start the asahi installer and choose the option 'UEFI environment only'
• the installer will ask to shutdown and reboot into the recovery of the stub partition
• follow the steps inside recovery until the point it asks to reboot, don't reboot, but press Ctrl-C to exit the script
• go to the Apple logo in the top left corner and choose 'Startup Disk'
• set your macOS disk as startup disk and reboot into macOS
• mount the EFI partition again using diskutil mount (note that the name may be different from above if you chose a different name for the UEFI install)
• copy the EFI and m1n1 folders from your backup over the new EFI partition
• reboot into Linux by setting the Startup Disk back to Linux or by holding the power button at boot
• check the UUID of the EFI partition with lsblk -f. Look for the one which is short (XXXX-XXXX)
• edit /etc/fstab, uncomment the /boot/efi line and replace the UUID with the new one
• reboot again and you should now be on latest firmware and back where you were