Why 1.1.3.9, download and install latest GCC:
https://www.aquariumcomputer.com/dow...enter-1-1-4-1/

I think you are not following the procedure correctly:
https://www.aquariumcomputer.com/kno...ux-4-firmware/

Be careful to use the firmwareupdate of the Maintenance menu and not from PAB.
FW-update-2.jpg

Can you show a screenshot of the error?

Gaël