Well i use w880i acoustics, with xaero ma loud farfield files, that'll make it.
Is there any big difference between the new and old W610i MAIN and FS?
I just flashed it, I haven't noticed a thing...
Another Thing:
My friend will buy a K550i within a few days, what can we do if it will be a CID 53 phone?

Cuz the "bible" sad, we can only flash CID 52 phones...