SXROM 32KB Emulator Issue [Solved]

I've noticed an issue on the Famicom game Dezaemon. Whenever you go to save an edited file, the save is lost or was never written. I've tested the Dezaemon ROM on a few emulators as well as on an Everdrive N8. The game runs, but its most vital feature (saving) does not work. Any idea why this happens? I read somewhere that SXROM games need to be in the NES 2.0 format to be read properly on emulation (otherwise they'll be read as a lesser sized SUROM/SNROM)? My theory is the .nes file (?) needs to be updated for the NES 2.0 format, so the full 32KB SRAM bank will be saved, but I have no idea how to do so. Any info/help is greatly appreciated! I feel this game would benefit greatly from having emulation/flash cart support due to the save-oriented nature of the game.

Also, I own an original copy of the game if anyone wants a scan of the PCB. Additionally, if you need info on how to navigate Dezaemon, I know my way around.

Thanks

You can update the header to NES 2.0, but there's no guarantee the emulator or device you're using supports the 2.0 bytes. You're looking at byte 10 of the header:

Format: http://wiki.nesdev.com/w/index.php/NES_2.0

Dezaemon's SXROM would be specifically these 16 bytes:



Easiest is to load the ROM in Nintendulator's header editor.


Edited to incorporate Joe's correction. I naïvely assumed all SXROM games were 512 KiB PRG.

I think Dezaemon has only 128KiB of PRG-ROM:

Alright, I updated the header and it seems to be working now! Thanks for the help guys!