How to (I want my phone W610i Cid 53 become Cid 52)

after , use update service of SE, My phone W610i , become Cid 53, now I want down Cid , ( cid 53 become 52)
How to??


Help

Congratulations on your new update security zone CID53.
Well the worst thing is that there is no free way to downgrade your CID but with paid service : Top Sony - Buy Ultimate Unlocker LOGs
Good news is that you can still flash your phone here : Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums