refresh the phone.... k810i

i flashed so many drivers & patches to my k810i. before that, i updated it with SEUS.
now my phone jammed. i can't reciev sms. other functions are ok.
i tried to install firmware again with JDflasher. but in oflash mood, when i add firmware files, flash it button is not active. only active button is "cansel cansel cansel"
now i tired of this.
now i want to add software again. just like in computer... format C:\ and install a fresh system.
is it possible? current version is cid 53. can i install cid 52 again?
pease help me...... i hope you will understand my situation. thank you...
:confused:

No you can't downgrade your CID,but go to this Flash K800 CID53 with K810 software CID53 (for begginers) - Top Sony Forums and try figure what's wrong

i read that link. i got the firmware also. but it doesn't flash... :(

finally i did it. this lesson is really good. i used america 2 genatic. 1st icon of main menu, depend on the genatic. so what is the best one?:)