advice, orange firmware and reset

[chriswebs23]

I want to factory reset my phone to 'start again'. It is rooted what is the best way to do this?

What do I do if I want to go back to orange firmware kj4 but can't due to the legal row?

 

[chriswebs23]

Anyone any advice would be great.

 

[chriswebs23]

for my rooted uk orange
PDA i9100bvkj4
Phone i9100bvkj4
csc i9100ORAKj4
build info mon oct 24 13:33:22 kst 2011

is this the firmware i need to get back to stock?

Hotfile.com: One click file hosting: GT-I9100_ORA_I9100BVKJ4_I9100ORAKJ4_I9100BVKJ4.rar

 

[chriswebs23]

or this?

[ROM+Guide]Official i9100 Firmwares KL1/2/3/LA2,4/LB2,LPE/Q/7/2/F/S/4/7 Download - xda-developers
Orange UK ORAKJ4 CSC: http://www.multiupload.com/4JEKMKF4GJ

this is where i found the other

[ROM] I9100BVKJ4 Orange Brand [24.10.2011][Android 2.3.5] - xda-developers
CSC: ORA I9100ORAKJ4 http://hotfile.com/dl/134274976/138b...BVKJ4.rar.html

 

[chriswebs23]

Will just try them anyway