The install script in the “new” 64bit image from https://wiki.caninosloucos.org.br/index.php/Instalando_um_sistema is broken.
It renders the Labrador unbootable (from internal storage).
The last line is supposed to flash the bootloader, but the install.img is nto where the script expects it.
either the documentation needs to be updated to make a cd install before running the script, or the script needs a better way to detect the installation files itself.
We found exactly what you had described, the documentation was update, in truth only adding the cd command shoud solve this issue.
Now should be fine.
Thanks!
Best regards,
Igor Ruschi