I did a factory reset (did not flash a rom) to my Note 4 (SH-N910w8) & now it seems that my EFS part is wiped or corrupt. No IEMI# as well as when I go into the service menu on the phone there is no command options! I do have my imei # from the box but I don't now how to rebuild the EFS partition so I can get back on the networks. Any help would be appreciated. Thank you!