3G Updated to 4.2.1 & 6.15bb Need Restore to 4.2.1

[gsxeclipsepsi]

Ok, I have a tired a few custom firmware and I don't have a mac

I updated to 4.2.1 then updated baseband to 6.15.00

Then installed PUSHDOCTOR it failed (so don't use it on 4.2.1) and cydia lost everything so I needed to restore.

I got it restored to 4.1 with 6.15bb it works fine.

But now how do I get back to 4.2.1 with already upgraded BB since iTunes won't let it without error.

If someone could post a firmware that would work cause there are a few people looking for this but no one has given the answer as to
YES this will give you 4.2.1 if you already have BB 6.15

Thanks
Kendel