A520 wont allow flash to combination firmware.
 

Ive an A520 which has been reset. when i try to remove frp Im asked to input numbers for the rollback protection, I can only input single digits yet my B: is at 11. shortly after typing in 1 as it only accepts single numbers the flashing fails and I dont know what to do, to flash combination or at least remove the frp

thanks

Hare you got direct link to combination firmware for UB security combination version.
Samsung Combination Firmware Database by HardReset.info Team

Remember to use Odin 3.13.1 atleast to write this file without problem.