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Hacking EZ-Flash IV and R4 DS...

GB-Link: Connect original Gameboy hardware to the internet through a web browser! Pokemon Gen1-3, Advance Wars, Tetris and more

Starlark · 2026-06-25T01:49:54+00:00

Connect orginal Gameboy hardware to the internet through a web browser with GB-Link USB I am happy to share a hardware project I have been working on the past few years that allows your Game Boy to connect to the internet through your web browser on desktop or android with no software install required on the host device. Also supports sending multiboot homebrew from a web browser and dumping GB/GBC roms and restoring saves. Supports emulating GB Printer to print images from GB Camera as well as supported GB-Printer games. Full list of current games/applications found at https://gblink.io This project has had tremendous software upgrades this year and grown tremendosly thanks to to efforts of @Essometer , myself, and many others. I developed the v2 hardware out of a need for better accessibility/availability as well as new QOL features. All aspects of the project are open source and as this is an rp2040 board you can also diy your own adapter with a pi-pico and a link cable. This project is still developing and I look forward to what people will use this platform for in the future! Video demonstrating gen3 double battle over the internet. Firmware and DIY wiring guide avalible here https://github.com/GB-Link/GBLink-Firmware Crowd supply link for hardware. Please sign up to get updates when the campain starts and to register your interest! https://www.crowdsupply.com/gblink/gblink-usb-v2 For updated list of games/applications as well as in browser firmware upgrades/configuration visit the launcher. https://launcher.gblink.io Pokemon gen1-3 trading. Gen3 all 2p link cable modes including battle, trade, record mixing, co-op battle tower. Thanks to efforts from @Essometer Gen3 pokemon also supports online connection between hardware and emulator players through a fork of mGBA Advance wars supports both battling and trading custom maps Currently supported games: Tetris Dr. Mario Yoshi Advance Wars Advance Wars 2 Pokemon Red Pokemon Blue Pokemon Yellow Pokemon Silver Pokemon Gold Pokemon Crystal Pokemon Ruby Pokemon Sapphire Pokemon Emerald Pokmeon Fire Red Pokemon Leaf Green Tools: Sending muliboot homebrew Emulating GB Printer to print to your web browser Dumping GB/GBC carts using a GBA Dumping and restoring SAV files to GB/GBC carts using a GBA GB-Link Discord https://discord.gg/MQBu6Ec5BV GB-Link Github https://github.com/GB-Link GB-Link USB v2

Thread starter Riquerico
Start date Jun 20, 2009
Views 1,135
Replies 1

Riquerico

New Member

Newbie

Level 1

Jun 20, 2009

I bought an EZ-Flash IV (original/"fat", and I'm expecting it to arrive in the next few days) and I would like to know if anyone could help me. I read this and this but I still have a question.

The only flashcart I've ever used is the R4, which I still use in my DS Fat. I would to know what will happen if I use the "boot slot-2" option (in the R4 main menu) while having the EZ-Flash IV inserted. Will it load EZ4's GBA loader or DS loader?

Thanks in advance