Most ROM hacking tools and game patches are designed to work with one specific, clean, and unmodified version of the original game's ROM. If you apply a patch meant for the "Squirrels" version to any other ROM, it will likely fail.
Use an online patcher or a tool like Lunar IPS to apply your chosen .ups or .ips hack file to the base ROM. 1635 pokemon fire red usquirrelsgba rom link
: "1635" seems out of place here. Pokémon Fire Red was released much later, in 2007, as part of the Pokémon series' third generation. Most ROM hacking tools and game patches are