When you insert EA7C, it informs you that the disk is corrupt and it is best to insert the backup. The backup, as being the wall-mounted notebook describes, is every digit and letter incremented by one – for this reason FB8D, which you find close to the taped 'X' on https://beckettoizqi.gynoblog.com/26775825/the-smart-trick-of-free-butterfly-puzzle-games-that-no-one-is-discussing