A user of ASUS Chromebook C201, I've successfully installed Devuan(the ARM architecture ) to my SD card and now I have trouble migrating it to the internal storage by following Debian Wiki. Since the installation method is different, I guess it's natural that it didn't succeed. Can you guys point me to the correct migration guide?

Also, any operations like shrinking/expanding partition on the internal EMMC storage returns "ERROR: cgpt add: one of the GPT header/entries is invalid". I tried to run with "cgpt repair" but nothing changed.
I'm kind of a newbie in Linux so any help would be greatly appreciated!
Sincerely,