in the morning tried to downgrade to 7720, but unsuccessful. after few hours tried again, but it seems that my phone is half-bricked...
anyway, connect the phone to pc, zune started and i see "restore"!... right, i can restore to 7720 and now my apps works!
tried now to update to 7740 offline, but the same situation: can't use apps!... tried to interop-unlock in 7720 with htcinteropunlock.xap, but can't find in connection setup "interop unlock".
please help me, because i really need to update to 7740 because of outlook forward message update and also because i need to use these apps (navigon is one of them).
it is possible to have a 7740 phone with interop-unlock?