Problem with call drops after upgrade to 2.2

[kuni_zdenek]

Hello, few days ago I installed the newest version of Kies (2.0.2.22071_128) which announced that a new firmware version for my i5800 is available - 2.2 Froyo i5800XXJP4. The upgrade went smoothly but there are two things that happen after the upgrade: first (critical) is that when somebody calls me the call is automatically dropped - seems like the "ringing" application that shows on display who calls me crashes, the network becomes unavailable for few seconds and I even don't see the call on the list of missing calls. Unfortunately, I can't even connect to Kies anymore which shows a message that I must turn the phone to Samsing Kies mode and that the current mode is not supported. Does anyone know how to solve my problem?