"Inactive SIM" means that the SIM card is no longer valid. When the phone is locked u have to get "Insert correct SIM" no "Inactive SIM".
P.S. Symox patch generator doesn't create patches from branded FWs.
What does it mean the SIM's invalid? I've tried three different SIMs, all working, but not with this phone. Not using branded software, but latest generic realeases.