Why/When you should use Write SEC > Repair Sec method for above models? MSL Counter blocked (TOOMANYFAIL or TMF Error) Failed to Unlock your phone with other tools Your phone has damaged/corrupted EFS Repair other issues related to Security/NV/EFS Does 'Write SEC > Repair Sec Method' Unlock S10/S10e/S10+ ? Only AT&T, Xfinity, Spectrum, Cricket, Virgin will be FULLY UNLOCKED & Repaired after Write SEC > Repair Sec All other carriers, this procedure WILL NOT UNLOCK YOUR PHONE! ATTENTION : T-MOBILE, METROPCS STILL NOT SUPPORTED FOR UNLOCKING ! How do i unlock my S10/S10e/S10+ Sprint,Boost,GCF with BLOCKED MSL Counter ? You should run Write SEC > Repair Sec first to repair the phone, And then Untick "Write SEC > Repair Sec" and Unlock your phone normally. You will need 10 Credits (2 x 5 Credits) in order to repair+unlock your Sprint/Boost/GCF phone with BLOCKED MSL Counter !