only way to have mep o tries left is with a device called DM3

go to following website

Secured URL

just had mine done by them works 100% and is the only way it can be done

the link provides all the info and what you have to do,but you do have to send or take it to their nearest service centre

and by the way i am no way anything to do with the DM3 it is just that it helped me reset my phone and is only known 100% way to unlock