GBA Bios Dumping Guide

By: GlaZed_Belmont

Hello, in this guide, I will show you how to dump a GBA bios

What you'll need:

• a 3DS, a DS, a DS Lite, A Gameboy Advance or a Gameboy Advance SP
• A GBA flashcart if you're not doing this on a 3DS (EzFlash, Everdrive, etc.)
• Open AGB Firm if you're on 3DS
• This homebrew app
• This python script

---

1. (3DS) Download the open_agb_firm.firm file and put it into your SD:/luma/payloads folder.
2. Download the Bios_Dumper.gba file and put it on your flashcart's micro SD card or your 3DS's SD root.

3. (NDS, GBA) Boot your console and run Bios_Dumper.gba.

   (3DS) Boot your console while holding START, select Open AGB Firm then run Bios_Dumper.gba.



4. You'll be met with a red screen like this:



5. Wait until the screen turns green like so:



6. Wait 5 seconds or so before turning off the system to prevent SD corruption.




7. After that, open your micro SD card on your PC




8. Open_AGB_firm users: the savefile is in the SD:/3ds/open_agb_firm/saves folder.

   Either drag & drop the .sav file onto the Bios_Shrinker.py file or run it with python3, this will output a file called bios.bin which is the correct bios.

   
   

   Here are the hashes of a clean bios on GBA
   
   MD5:a860e8c0b6d573d191e4ec7db1b1e4f6
   SHA256:fd2547724b505f487e6dcb29ec2ecff3af35a841a77ab2e85fd87350abd36570
   

   Here are the hashes of a clean bios on DS/DS Lite/3DS
   
   MD5:1c0d67db9e1208b95a1506b1688a0ad6
   SHA256:782eb3894237ec6aa411b78ffee19078bacf10413856d33cda10b44fd9c2856b
   




9. Done!

---

Please join this server for further assistance

---

~ GlaZed_Belmont