Quote Originally Posted by hamid0006 View Post
is any firmware cid 49 for k800i for change to k810?
No , all K810 firmwares CID52.
Just update with SEUS to last version R1KG001 ( CID52 ) then you can convert K800 -> K810.

Read step by step here : K810 firmware in K800, is it possible? : Software : Sony Ericsson @ Esato