Unable to mount iPhone

[klaus2008]

There are people who advise to issue the following commands after having connected the iPhone.

idevicepair unpair
idevicepair pair
idevicepair validate

Does this solve the issue or do you still receive the same (or a new) error message?

[dataworx22]

Hi Klaus, thanks again for taking the time to help with this. I've previously tried the pair/unpair commands, this is the output:

knoppix@Microknoppix:~$ idevicepair unpair
QueryType failed, error code -256
knoppix@Microknoppix:~$ idevicepair pair
QueryType failed, error code -256
knoppix@Microknoppix:~$ idevicepair validate
QueryType failed, error code -256