Thanks for reaching out br0f. Please forgive the long list of questions 🙏
What model number is your Saturn?
What model number is your Fenrir?
What model memory card are you using in your Fenrir?
What version of Fenrir firmware are you using?
Have you followed any Fenrir troubleshooting guides?
Have you modified the game's files in any way (rename, delete, conversion tool etc). ?
Have you tried redownloading and recopying the game to the Fenrir memory card?
Does your Saturn have any other mods beside the Fenrir?
Do you have any accessories inserted into the cartridge port or expansion port (Pseudo Saturn, Action Replay, 4MB Expansion, Backup Cart, Video CD card etc.)?
Is your Saturn battery healthy?
If you erase your save game from the Saturn system menu (considering you're only on the first checkpoint of the training level) does this fix the issue?
If you load V1.001 or V1.000, and let the Saturn sit for 2 minutes, does the game eventually start?
Do other games work on your Fenrir?
Do the shoulders buttons consistently not work whenever you bootup the game, or did this only happen once?
How many times have you tried booting V1.002 overall?