Help to debrand c905

Hi Guys, I'm having problems with WiFi conection on my T-Mobile c905 so I am wanting to debrand to see if this cures it. Which is the firmware I need?

hipID:E800,EMP protocol:0401

PHONE STATE: "RETAIL"
FLASH CID: 0052
OTP LOCKED:1 CID:52 PAF:1 IMEI:35202203544263 CERT:RED

Model:C905
MAPP CXC article: R1EA033 prg1208-0485_TMOBILE_SI
MAPP CXC version: R1EA033
Language Package:T-MOB-INT
CDA article: 1210-4888
CDA version: R23A
Default article: 1205-9083
Default version: R1EA033

Operator: 000-00

Elapsed:16 secs.

Thanks in advance :)

Try here : [Debrand] A2 (Db3150) Tutorial - Top Sony Forums

U dnt have to do alot of things
Ist download A2 uploader to connect phone for puting custom upgrade.xml file,
another thing A2 cda generator simply generate CDa for ur phone as ur location put that file
- Go to tpa/preset/custom directory and drag the customize_upgrade.xml to there (after copy, check if it is there):
after that shut down A2uploader n then switch on phone that phone can upload .xml.
Then SEUS n simply folow the step,n upgrade your phone.it's up.