R4isdhc problem! please help

Hey guys i have a problem with my r4i from r4isdhc.com and its basically that when loading some games a black box appears with the message disk errorcode =-81 please reset the sistem please help there are some games the i want to play like ragnarok and i cant find any help so please if you know something about it please help me
Thnx
;)

Are there any other games that don't work or is Ragnarok the only one?

Castlevania Order of eclesia, PRofessor LAyton, A lot of games doesnt work

I have the same problem

im not really sure i can help but ill try, first off which r4i are you using and what firmware are u suing for it? i also have an r4i and am running firmware 1.17b and havent had any problems running the games you have mentioned?C