my desire is SLCD version. do u have other way to update it to froyo?

if your desire is not rooted or you do not plan to root in near future, you can try using this.

you can follow the steps here.

http://forum.xda-developers.com/showthread.php?t=741836

but DO NOT UPDATE with the European ROM. it doesn't support SLCD and your screen will not power on after the update.

Instead use the ROM below. (Maxis set isn't locked in the first place, so no need to unlock it. )

http://shipped-roms.com/shipped/Bravo/RUU_...3921_signed.exe

username : shipped
Password : shipped