Hi, i received one SM-N910F phone with problems registering to network, using other phone and writing the same IMEI i have checked the phone is not blacklisted, anyway i have downgrade to android 5 then ,rooted, reset EFS and write new cert , when phone restart using keypad *#06# i have checked but phone lost serial number , i put a SIM card in phone but phone continue with initial problem, i repeat process, reset EFS and write other cert but phone continue without serial number and not register in network. I have disabled LTE/WCDMA and choice only GSM mode and phone is working, register in network and make calls, well, i have upgrade again with last android version (6.0.1) but when finish flash process there is a message , phone dont have DRK . now , how to repair this DRK problem ?
I have created all backups.
I have created all backups.
