Headunit showing No Cd Help

[mr black]

Hi I have been through loads of posts but none exactly the same

Installed a brand new phatbox in to my audi concert2 worked fine yesterday i removed the dms to add more music inserted it back into the pb now nothing comes up no cd .
Ran dms doctor comes up with sytem files  FAIL could not find system file H:\<!DOCTYPE...

Works fine with the pn music manager

Any ideas

Thanks in advance

[mr black]

had a play updated the firmware to 7.02 seems ok now