Hi there. I have recently successfully unlocked my Sony Ericcson W810i with this tutorial.
I was really concerned as I was unable to find my MAIN firmware file for: R4ED001 but after reading this post from another forum...

"There is no R4ED001 main firmware, I was looking for it too, but how I understood its sony's original firmware and you cant have it , so you will need to find R4EA031 main firmware & fs for flashing...."

Here is the link for the R4EA031 file: Firmware Sony Ericsson W810 ~ FIRMWARE MOBILE PHONE

I used the generic one as my phone is from EUROPE. (The far top link.)

I also had a bit of a chew trying to find the USB Flash Drivers. I was unable to find the 64 bit version for my laptop, however my main PC runs on Windows 7 32 bit. Here's the link for the 32bit drivers which worked for me: USBFlashDriver - Download - 4shared - John McHale


My phone's Platforn is: DB2010
My phone's EROM CID: 49
and I was locked to the Tesco network.

Just incase you needed that info.

Have fun! :)