You can upgrade, but I would wait with upgrading to CID52. You don`t gain and lose much. Look only upgrade can be made ( CID ) , not downgrade.
If you upgrade, you can never go back.
Originally Posted by number1
upgrading from cid:49 you lose nothing but gain, a faster more stable phone and you can use the lastest better firmware.
I am quite confused what should i do stay on CID49 or go to CID52.