Symptom: Factory default of M-series fails. <br> Problem: M-series units produced in Q2 of 2017 have factory default backup stored at /mnt/ubifs/backup1 instead of /mnt/ubifs/backup . <br> Solution: Change the name of the /mnt/ubifs/backup1 directory to /mnt/ubifs/backup This bug is fixed in release ECN 170526-01