Which version are you using? If you’re using 1.1 or 1.2 it’s because those don’t work on older Emulators. This was fixed in Versions 1.3 and beyond.
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Hi there! Having the same issue rn. Using the R4 card and snemulds, tried patching it through both flips and the https://www.romhacking.net/patch/. But nothing worked for me, still white screened. Has anyone figured this out yet?