Please i need help for my Father's K800, i tried to upload language files and sound files via using farmanager, uploading procces is completed successfully, after that i switched the telephone on, all is good till now...

after a while i tried to connect the phone to continue uploading other files, my PC couldn't recognize the phone, also i couldn't turn on the phone. it looks like a dead phone.....

Plz i need help as soon as possible.