hi, ChillyWilly, Conle:
Using old card in Neo2 Pro Manager will "old version or invalid neo2 menu type! please take a format!", that's because we had changed the fat address from Mbit(5) to Mbit(15) , and leave almost a whole 0~15Mbit space for N64 myth menu. so the Neo2 Pro Manager will show the message when it verify fat in these old card.
but very sorry for this problem, :'(only one method to resolve: format again! and burn again!

we promises this changed will never be reversed again, so ronaldo_76, please take a format! Once you done these, you do not need to burn game again when new menu comes out. You just need to browse the new menu file in "BIOS Path A-1" or "BIOS Path A-2" in the right panel, then click "burn" button, the Neo2 Pro Manager will compare the menu and burn if any different. Generally if there are no significant change in menu format, you do not burn the game rom again.