I have the same problem too. I reflashed RX-51_2009SE_20.2010.36-2.002_PR_COMBINED_002_ARM.bin and then reflashed RX-51_2009SE_10.2010.13-2.VANILLA_PR_EMMC_MR0_ARM.bin. After reflashing was done successfully, making calls and receiving calls could be done. However, all calls will be disconnected suddenly. All calls last no more than 10 mins. Today, making calls and receiving calls are disabled aftter "All telephony functions, including emergency calls, are disables due to a communications error. to recover, you might have a reboot the device." was shown. It seems that this problem can not be solved by reflashing rom. Any suggestions?