1.download combi file on support area
2.flash combi file after finish go to setting-dev option and then tick OEM unlock.
3.factory reset from setting
4.reset frp with select J510F or others.
5.now..enter download mode and flash with stock rom (flash only boot-pda and cp)but in PDA untick userdata and meta-data/fota.zip
6.after flashing completed set enter to recovery mode and just press reboot now.
6.now let device booting after booting completed go to download mode and you will see FRP lock = OFF.
7.flashing with stock rom again and finally done.
2.flash combi file after finish go to setting-dev option and then tick OEM unlock.
3.factory reset from setting
4.reset frp with select J510F or others.
5.now..enter download mode and flash with stock rom (flash only boot-pda and cp)but in PDA untick userdata and meta-data/fota.zip
6.after flashing completed set enter to recovery mode and just press reboot now.
6.now let device booting after booting completed go to download mode and you will see FRP lock = OFF.
7.flashing with stock rom again and finally done.
