d50 illegal card issue

[saturn]

i have 3 ram cards for my d50 and one of them says „illegal card“ for a few days now. the other 2 are still working fine. allready tried to clean the contacts but didn’t help. any ideas?

[saturn]

well i guess it could be the battery? will try to change it but then all my patches are gone f***!!!

[Rolandplayer]

Tip: If you change the card battery while plugged into the keyboard or rack unit, while powered on, it will not lose the patch information.