Hi - I'm new to this site and these forums and I've just got a few questions before I begin to try to unlock my phone.

I've got a SE k550i locked into T-Mobile (in the UK). It was CID 51, but I upgraded it to CID 52 using XS++.
I'm following this guide and I'm at the stage where i need to generate a quick-access patch from a MAIN (.mbn) file. My phone's firmware is currently R1JD001 but I can't find a MAIN file of that version.

Would it be safe to use another firmware for the k550i (R8BA024) that i got from here here and then follow the rest of the guide using that firmware? If it isn't a good idea, could somebody point me to the file i need (k550_R1JD001) because I've had a look around and i can't find one anywhere.

I also saw something on page 20 of this thread about a guy in a similar situation, and simox posted a solution, but i didn't understand it...

If anyone could help I'd be really grateful!