Hi seansully.
Thank you for making a video on this game, It's greatly appreciated.
For the end bit, the way to get past is to run the command delete_sector 0xff25. This sector is shown in the first error message, and I definitely should have made it clearer, so sorry for the confusion.
Edit: I've updated the game to show another recurring error message if the player takes too long to get past that bit. Thank you for your feedback.