Hi, I have a GBxCart RW + FlashGBX, and I'm trying to write an emulator .sav to a batteryless SRAM repro cart (FlashGBX identifies it as: Save Type: Unlicensed 512K SRAM 64KiB, Cartridge Type: 2006_TSOP_64BALL_6106 with W29GL128SH9B). My emulator save is 131088 bytes ("Pokemon - Emerald Version.zip"; 128KB + 16 byte header I think). Every attempt to write it via FlashGBX ends in either "save file was erased due to corruption" or it reverts to a previous save. I also tried patching a fresh Emerald ROM with the gbarompatcher website (SRAM Batteryless patch) and writing that instead, same result. I dumped the SRAM after making a test save on the cart and ran it through Python to check the sector structure, the magic bytes don't match standard Emerald format (expected 0x08012025, getting values like 0x01006f4f). PKHeX also rejects the dumped .sav with "unsupported file type/size" even though it's 65536 bytes. ("FreshPatched.zip" is a rom and save dump from after I wrote the patched rom to the cart, and "TestSave.zip" is a save on said patched rom up to the point of acquiring a starter, and then saved at Route 101. I progressed to the same point for "OG.zip") Writing to the OG, Patched, and Test-Saved roms through FlashGBX and injections all ended in errors, regardless of how many times I tried to read the bytes and find the save point. At some point in the process, it started saying that the SRAM size was 64KiB even though I could have sworn it was saying 128KiB for a while but then it changed and I don't know how or why that might be. Maybe I'm just going insane. I've been doing trial-and-error for two days now. Questions: What save format does a batteryless SRAM cart like this actually use, and is it compatible with a standard emulator .sav at all? How can I write my save properly to a cart like this? Is there a tool to convert/inject an emulator save into the format this cart expects? Thanks in advance.

PocketNES update, assisted by AI

Krem Quay · 2026-05-13T13:11:26+00:00

Thanks to AI like Gemini and Claude Opus, a person like me who doesn't know anything about coding can add more mappers to PocketNES. Take a look: https://github.com/GamingFanboy365/pocketnes

EZ Flash IV (miniSD) Problem.

MF_DarkMike

New Member

Newbie

Level 1

Apr 6, 2009

Hello thar, I had a problem while I was testing various skins for my EZ Flash IV, but we will call it the EZ4 Phat for now. Anyway, I brought 4 of these things for multiplayer and I was testing something with one of them. Though, I was having a game break, and decided to play Hachiemon for a moment, figuring out more of the saving bug. Although, I have forgotten to put the save folder at the beginning so it doesn't mess up my card. Though, when I went to reset the game, I accidently held R in combination of L + Up + A + B, and it began to update without my knowledge. (Because I forgot to remove "ezfla_up.bin" while I was doing so.) My timing was horrible when I switched it off, because at that moment, I seem to have bricked my rare cartridge. O-O;

I have tried various methods of help at the IRC channel, trying what I can to revive my bricked EZ4 Phat, and get it to work properly. Though, the methods were designed for EZ4 Deluxe, meaning it's not my type of card. However, I gave up, and put it in my flashed Polar White DS Lite, and for some reason, decided to hold R + X together. It launched one program from there, but it said "Can't file ezfla_up.bin Power off and Restart" when I already had said file on my microSD/miniSD.

I do not know any further on how to do this, but I may be stuck with a housebrick on my room until a solution comes up hopefully. I do have a working dump provided by someone on IRC, but I don't know how to run the dump correctly. I may be having the worst luck ever since Nintendo released the DSi yesterday.

EDIT: Actually, nevermind. I had to get past a black screen while holding R, and it updated just fine. I apologize for the drama I've caused.

Hacking EZ Flash IV (miniSD) Problem.

New Member

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