Another option is to install this module: https://github.com/ClusterM/retroarch-clover , it's will run the game on another emulator and will probably work.
Hey, thanks for the fast reply. OK I tried installing the Clover stuff and as far as I can tell that went in fine however it didn't fix Berzerk :( It got further and doesnt drop an error but it just stays on a grey screen and doesn't play the game. Tried both cores with retroarch. Will also reply via the email you sent.
I have uploaded an exclusive version of the game for the NES Mini. Thank you for your patience.
All works! Excellent port, feels like I am back in the arcade.
Hey there! I understand you're looking for a distributor for Berserk. If you're interested, please feel free to send me an email at email@example.com and we'll get the ball rolling!
The NES Mini version still falls apart badly when you exit a room or die - it slows almost to a standstill. Are there any particular settings I should be using when uploading it to the device?