XBEE Pro S2C bricked

Device XBEE PRO S2C configured as coordinator that working for months without any problem but now stop working without reason (radio disapper suddenly)
Device communicate with microcontroller using serial port. (57600N81)
Micro at startup set the radio reset pin for 100ms after 175ms I see the first modem status frame (0x8A) with status = 0x00 (Hardware reset)
But after this device can’t start coordinator network
Serial port is working normally but if I read some register (CH CE and others) radio return parameters values always zero for every read command

Sound like you need to reload the radios firmware or make sure that CE is set to 1.