There could be few reasons.
First, in your post sometimes you name it global_cfg and sometimes global_gfg. Maybe name is wrong.
Try to do all file operations with Total Commander instead of your default file browser, which in many cases do not allow to change file extension while renaming and you end up with wrong file name.
Total Commander will notify if any operation is not done successfully, but default file browsers in many cases are not giving any feedback if operation does not end correctly.
Before copying new global_cfg from USB, delete old one, or rename old one and delete it later (after copying new).
And most important: before any file operation force stop app in Android settings, because when file is used by app it can not be deleted, replaced or modified.

BTW, you could have put all your problems in this one post.
No need for separated question about map colors which could be solved by copying all missing files in scheme folder.