First of all: please always check the output of the commands, if there were successful.
Please do a flash based backup as soon as possible before doing anything else. The file based backup is not enough to restore the box.
To remove the custom bootloader:
Just reverse the process and replace the custom bootloader on the flash with your backup.
But I would just keep the custom bootloader on the box and just set ofw1 as default boot slot, as this has the same result for the user of the box.