Cartridge is going to remain the same, adding new features is not on the table now. A lot of units have been sold, cartridge has been extensively tested and proven to work well for many years now.
I believe that there were given instructions here in the forum about how to convert Xeno Crisis to...
The guy selling this (w45050), was banned from this and other forums for selling conversions as original or giving deliberately a wrong description. I wouldn't be surprised if he's reading this....
I doubt it. But if you try the original PAL, it should still work only that without sounds in some games. Give it a try.
My guts tell me that you have a problem with your C board. I can see some work being done on it. Do you have another C Board to try?
Have a look at this please...
That's it in a nutshell and the problem is that they might be wrongly mistaken as an original. Someone unscrupulous could make his own stickers and try to sell it as original.