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

Toggle sidebar

Hardware my newly modded GBA

Thread starter Cactuar
Start date May 10, 2014
Views 2,534
Replies 6
Likes 6

Cactuar

Well-Known Member

Member

Level 2

May 10, 2014

I was bored so I decided to upgrade my GBA
Backlit mod
glass lens
paint job (bulldog adhesion promoter, and krylon)

I'm done and I like it.

Reactions: Lycan911, nxwing, SSG Vegeta and 3 others

WigWrm

Well-Known Member

Member

Level 8

May 10, 2014

Great Job! My backlight kit is still sitting in its box (been over 2 months!). You've given a little push to help me finally do it.

Nusdogg

Well-Known Member

Member

Level 4

May 18, 2014

Back lit conversion is the best thing you can ever do on a GBA. Well worth it.

crea

Well-Known Member

Member

Level 7

Nov 2, 2014

Nice one. How's the battery life with the new screen?

WarioWaffles

Well-Known Member

Member

Level 4

Nov 3, 2014

Nice paint job, is that adhesion promoter acrylic based? The only luck I've ever had spray painting plastic is with acrylic based spray paint like plastikote.

endoverend

AKA zooksman

Member

Level 12

Nov 3, 2014

Can you do it for me??? i'll pay u

II EXDEATH II

Member

Newcomer

Level 1

Jan 22, 2015

omg man youre making me drool thats the exact gba i want except all the buttons white or just all black

BTW i seen a vid on YT awhile back that tested original vs ags 101 gbas and the modded gba w/101 was like 20% longer battery