i think that after the update you made, your phone got locked again.
if you want to unlock it for free read here Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums and use files for w880 cid53 instead of k810/k800 cid53
and here for patching cid53 Patching CID53 (DB2020)DB2010,2012 - Top Sony Forums

Note! in order to run the executor from your phone, you will need a sim from the network that your phone is locked in.

Sorry for my english, hope you will understand and it will be helpfull :)