Downgrade galaxy ace to froyo 2.2.1

Downgrade galaxy ace to froyo 2.2.1
Most of you people upgraded your ace to gingerbread. Gingerbread has many advantages. Bus some want their froyo back. so here i tell you hoe to bring back it to froyo
This downgradation usefull all when official gingerbread comes. Because kies not allow you to upgrade official version as you have already been updated it. So after this downgradation you will able to update through kies.


Firs you have to install kies in your computer.
After that you have to download odin multidownloader. If you already have it then skip this step.download odin hereodin

now download cooper.ops herecooper

now you should download these 2.2.1 firmware which is not S5830DDKC1 but it is S5830ZSKC2 becuse direct flash with original firmware may brick your phone
so first download this firmware
download herefirmware password is samfirmware.com and extract rar file you see infolder some apboot,modem,csc,code type folders whis you have to locate in odin which i tell in below


now swith off your phone and start it into downloading mode(press home+power+volume down button)

Now connect it with computer and start odin
now in Push Ops and locate cooper.ops
now in Boot  locate APBOOT_S5830XXKA7_CL869577_REV03_user_low_true.tar.md5
now in Phone locate MODEM_S5830XXKB1_CL931744_REV03.tar.md5
now in Pda locate CODE_S5830ZSKC2_CL967993_REV03_user_low_true.tar.md5
now in Csc locate CSC_S5830OZSKB2_CL926507_REV03_user_low_true.tar.md5
leave Efs blank and hit start button.
wait until flashing complate. it take around 3-4 minute. when your phone start  disconnect it.
Phone is in chinese language. you need inglish language and S5830DDKC1 firmware so again switch off it and start it in downloading mode. before that download ddkc1 firmware hereDDKC1 Firmware Password is samfirmware.com
now connect your phone in downloading mode to computer

. open odin and in OPS locate Cooper.ops
Now tick on one package in option you see at left side top in odin
Now all option in right side will hidden. now only one button can visible which is one oackage. push that button and locate S5830DDKC1_S5830DDKC1_S5830ODDKC1_HOME
now hit start button and wait untill flashing complete. Now you gor original firmware which you got whenw you purchase phone.