i recently flashed my 6150 with version 5.23 FuBu, idid make a back-up of the original v4.18, however now my phones makes a screeching sound like an old dial-up modem dialing a number, when i reflashed the old firmware back on, it is still the same, this sound is coming from the speaker,

is this phone officially dead or can it be revived, i've had this phone for 6 years and i only recently got the screen working and now this