@KingMike I just came across your post - I'm playing Mother 3 english 1.2 on an EZ IV, I just had to use PSRAM. I think you do this by pressing start when the ROM is selected to copy it to PSRAM (takes a few minutes) and then run it from the root of the card. But the EZ IV can only have one ROM in PSRAM at a time, so if you have more than one ROM over 16,384 KB, you'll have to do this before running each one. Best of luck!
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Re: Hardware Review: Everdrive GBA X5
@KingMike I just came across your post - I'm playing Mother 3 english 1.2 on an EZ IV, I just had to use PSRAM. I think you do this by pressing start when the ROM is selected to copy it to PSRAM (takes a few minutes) and then run it from the root of the card. But the EZ IV can only have one ROM in PSRAM at a time, so if you have more than one ROM over 16,384 KB, you'll have to do this before running each one. Best of luck!