MP3 Upgrade tool question?
 

After me trying ample of diffrent firmwares using version 5.09 pf upgrade tool i sometimes get this message aftre it nearly completes the upgrade

"Read or write device information failed! Please exit the program and check if device is connecting"

Does this mean there is problem with tool or just not correct the firmware?

It teases me sometimes as i think i sorted it then i get above message.

Sorry for all the questions too.