Not sure of your cover art issue, but as far as connecting...
If you're on windows, just start up BeoPlayer, and it will connect and this will mount the BM5 to your computer. You should see a "share" pointing to it in Windows Explorer
For Mac (thanks to Carolpa):
start BeoConnect and make a connection with the BS5/BM5.
go to Finder
make a connection with the BM5; if fails then make a connection as
BEOMASTER5\BM-USER (note: your system can also be named "BEOMASTER 5"; you should look it up in the BS5)
your PASSWORD
If you've forgotten your password, then go into service mode (SETTINGS, then >>,>>,GO) and change it.
Stan