Debranding your phone will wipe anything stored on the phones memory, so be sure to back up anything important first.
It will not affect anything on your sim card or memory stick...
Do not attempt to reflash without first charging your battery fully!
1) Order log account from davinciteam website, download 15.94 client and unzip to suitable location on your C drive - I suggest C:\Temp
2) Run Launcher and input login details (ones e-mailed to you from Davinci Team) where it says Account Details - click Info and ensure that Credits = 1
3) Check connectivity by clicking Server Status - you should get something like:
Client Version 15.94
Checking server status...
June 5, 2006, 9:56 pm Semc phones(K700,Z1010): 76 out of 200
Other(T610,T630,Z600): 6 out of 400
Page update period: 10 minutes
Execution Time - 00:00:00
Done!
4) Change port settings to DCU60 and 921600 (with boxes next to each ticked)
5) Tick 'Enable PlayNow button in phone menu' (if you want this feature) and also 'Fast CDA Change' -
DO NOT tick 'Increase SMS Inbox Volume' as this will knacker your phone
5) Power off phone and click Read CID/Test Cable. It will prompt you to hold the 'c' button on the phone and plug in the USB cable - you should get:
Phone attached!
Detected SonyEricsson: K750/D750/W800/W550/Z520/Z530.
CsLoader Accepted Ok!
Status Ok, OTP Close, CID49, PAF1
IMEI: ******-**-****** (stars represent your IMEI number)
Phone CID 49, Color RED
You must use CID49 Flash Files For this phone!
Press button - "Get Files From Web" and download free firmware
Execution Time - 00:00:06
Done!
6) Click 'Get Flash Files' and then 'Update File List' - FTP transfer should begin
7) Scroll down the list of files and highlight W810 R4CK003 EU2 - ensure both tick boxes are ticked and then click 'Get File'. Your PC will now start downloading the relevant firmware - took about 5 mins in total on mine
8) Ensure that the 'Main' and 'FS' text boxes are filled with the firmware you just downloaded e.g. C:\Temp\Se\Flashes\W810_R4CK003_MAIN_EU-EMEA-US.DVT and C:\Temp\Se\Flashes\W810_R4CK003_FS_EUROPE_2.DVT respectively - tick both tick boxes next to each file, but at this point do not tick 'Finalization'
9) Change the CDA box so that it reads 'CDA102337/10 - Europe 2'
10) Now click 'Flash' and follow the script instructions on the left - if all has gone well e.g. no errors and it says 'done!' at the end, you are good to go with the finalization... I recommend removing the battery from the phone everytime you disconnect it from the USB cable, so remove battery before you finally flash the phone for good. Now tick 'Finalization' box and then 'Flash' again - this will envoke the actual process of reflashing the firmware
Disclaimer: I will not take any responsibilty for this damaging your phone. I used these same instructions myself and it flashed without any problems. If you're unsure of doing it yourself then I suggest you don't try it...
Edit - flashing as above fixed my LED flashing problem too