Most modern Pokémon ROM hacks are built on rather than the later v1.1 update. What's the difference between different roms?
In the sprawling underground archives of Pokémon ROM hacking, few file names spark as much curiosity—and confusion—as the elusive . 1636 Pokemon Fire Red - U-- Squirrels- Download
The specific reference to "1636 Pokemon Fire Red - U-- Squirrels- Download" seems to point towards a ROM hack of Pokémon Fire Red. The details provided: Most modern Pokémon ROM hacks are built on
Technical aspects of FireRed hacking (summary) Unbound or Radical Red).
: Select the .ups or .ips file of the hack you want to play (e.g., Unbound or Radical Red).