Harry Potter - Major help required

So, I download Harry Potter And The Order Of The Phoenix for my Ds, which runs on the R4. All good so far. Then I deleted it, because I got bored of it. Still fine.
About 3 months later, I decided to play it again. I put it back on my R4 to give it another shot. I placed the SAME game, SAME rom on but a white screen came up. I downloaded ALL the Harry Potter And The Order Of The Phoenix roms on romulation, but still I got a white screen. I searched around, downloaded some more, and they still didn't work. Can someone please help me?
Oh, my R4 runs on version 1.25 by the way.

Have you upgraded your firmware in the past 3 months? Maybe that caused the issues?Check out the Common Issues thread for some suggestions:
https://www.romulation.org/forum/index.php?topic=1462.0

Replying to #2

Yep, been updated. Still not working.

Try backing up and delete the save file, and reinstall the firmware.