yes but he wiped the SD card so if he is on 2.1 he wont be able to upgrade back to what ever firmware he was on before. This backup is required as part of the guide. If he is on 2.1 additional steps and equipment are required to get backup to a higher version safely.
hmm thats a shame, so remember kids! always make backups
jokes aside good luck with this and I hope OP gets it fixed