spd 7731 frp problem .................. what is problem ????
 

Select Boots one by one,Hold Boot key.
If read device info success all operations will work fine.

Hello,
Can't connect until u press correct boot key ,,, most of mbles have vol+ is boot key hold and connect and try

Sent from my S_plus using Tapatalk

Don't try to format in service mode.

Select correct boot or try one by one ( plane or AltLdr - total 6 boots)
Then do format your phone.

Note: latest driver must be installed from support only.
Use charged battery and connect with correct boot key pressed..