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