Which is the configuration for the phone for WM 6.1?

[beginner]

I have tested diferent wm 6.1 versions with radio 1.57 and I am having some strange problems with communications (seventime lotus notes push mail) due problems with the radio and on the other side the symbol of the communication type Gprs (G, 3G, HSDPA) only appears times. I think is due the band selection. I have been trying to change from Auto to the other option but no way, time it words (symbol and comunication when on gprs) and times not.

I think is due rom-radio are not really designed for Europe networks.

Does anybody found a solution?

[pdajoy]

You already tried AP4 and 5 beta. Network Wizard from this ROM is the best.
I found the AP rom give me better band switching than others.
Maybe problem is in radio 1.57 and not rom issue.
What about using radio 1.50 ?