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

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Hacking EZFLASH Omega not saving

Thread starter lava123
Start date Aug 17, 2019
Views 1,332
Replies 3

lava123

Well-Known Member

Newcomer

Level 3

Aug 17, 2019

I am using an EZ Flash omega on a classic gameboy advance, model AGB-001, Kernal 1.06 and firmware 7, all my save files are corrupted and no game has any success in being able to save, does anyone know the fix to this issue?

FAST6191

Techromancer

Editorial Team

Level 33

Aug 18, 2019

What batteries are you using?

lava123

Well-Known Member

Newcomer

Level 3

Aug 18, 2019

FAST6191 said:
What batteries are you using?

what do you mean by this? like batteries literally to power the console? sorry haven't been in the gba scene for a while.

FAST6191

Techromancer

Editorial Team

Level 33

Aug 18, 2019

lava123 said:
what do you mean by this? like batteries literally to power the console? sorry haven't been in the gba scene for a while.

Sorry. Really should not do short form replies before bed.

Anyway rechargeable batteries seem to cause endless fun with some flash carts (they are 1.2 volts as opposed to 1.5) and as the original GBA uses nice AA batteries...