Do you have the backup of your EFS partition when you unlocked your bootloader?
If you've unlocked with freegee there should be a folder on sd card named FREEGEE. Inside of it try to find files named something like m9kefs1-backup.img
If you have them leave a reply and we'll continue
So after three errors sim got unlocked on latest slimlp (29/05) but touchkeys didnt work. [emoji28]
On validus i managed to unlock my sim after about 20 error messages so i could atleast deactivate sim pin on my phone without switching sim card.
So i guess you need to be lucky to get it unlocked.