The closest match is a from r/PokemonROMhacks (April 2022) titled “1636 Pokémon Fire Red: Squirrels UPD – final beta before takedown.” The link was dead, but comments described it as a joke hack where every Pokémon sprite was replaced with a pixel art squirrel, and the Pokédex was renamed “Nutdex.”
Example: Hex 0x664 = decimal 1636. In FireRed’s memory, this could point to a blank or garbage species.
Understanding how this file interacts with modern updates is vital to avoiding broken save files, black screens, or game crashes during your playthrough. What is the "1636 Squirrels" ROM?
Because it is a consistent standard, creators know exactly what they are working with when building their patches. Key Features Often Associated with "Upd" Hacks
In the early days of Game Boy Advance scene dumps, files were categorized by release numbers. The number was assigned specifically to the North American release of Pokémon Fire Red Version 1.0 , dumped by a release group known as "Squirrels".
The cartridge’s world differed from the one in the market stall: towns were ringed by great oaks with carved faces, ledgers in the Poké Marts recorded trades in acorns and berries, and Gym Leaders were woodland stewards. Pewter City’s gym was a stone circle guarded by a veteran Onix and a stern, twined-rope challenge: bring back the ancient Acorn of Strength from the heart of Viridian. Vermilion Harbor still had a ferry, but its captain demanded stories instead of coins — true tales of squirrel heroics.
: The archive zip or unzipped file should explicitly contain 1636 - Pokemon Fire Red (U)(Squirrels).gba .
This particular version is known as . It's a faithful digital copy of the original 2004 Game Boy Advance (GBA) remake of Pokémon Red.
: Praised for its incredible depth and "perfect" difficulty on hard mode. How to Use the 1636 Squirrels Update
The "1636" ROM has been the standard for nearly two decades for one simple reason: it works flawlessly. The shared standard eliminates guesswork and technical failures, allowing creators to focus on game design rather than compatibility. While some modern projects have moved to expanded engines like the CFRU (Complete FireRed Upgrade), that engine was built specifically with the "1636" ROM as its foundation. For the majority of ROM hacks, and for the foreseeable future, .
To "update" your game with a mod, you typically follow these steps: Obtain the Base : Ensure you have the 1636 - Pokemon Fire Red (U)(Squirrels).gba Download the Patch patch file from the official source of the mod (e.g., PokeCommunity Patch the File : Use an online tool like the Marc Robledo ROM Patcher or software like : Many mods check the CRC32 hex code of your base ROM. For the Squirrels version, this should be to ensure total compatibility. Quick questions if you have time: Were you looking for a specific mod? Need help with the patching process? What's the difference between different roms?
Custom region (Borrius), custom soundtrack, sandbox difficulty sliders.