The phone's original software or ROM has been modified

What is modifying the software or ROM and what purpose does it serve? 

It is a modification of the memory used to delete applications or customize the factory-installed settings of the phone. Requires advanced technical knowledge. 

Occasionally, it may not be possible to unlock a cell phone because the original software or ROM has been modified.

If you have modified the software of your phone, please restore the phone to its original settings to complete the unlocking process successfully.