The term "1635" in the context of ROM hacks like USquirrelsgba refers to specific patches or standards applied to ensure the hack works flawlessly across various platforms. To ensure that your installation is 1635-compliant:

Solution: Your ROM is corrupted or incomplete. The 1635 Squirrels ROM should be exactly 16 MB. If it’s smaller (e.g., 4 MB), you have a trimmed or bad dump. Re-download from a reliable No-Intro archived source.

Success indicator: The screen should flash white, then display the iconic “GAME BOY” Nintendo logo, followed by the Game Freak intro. If you see “The previous save file will be loaded” or a modified title screen (sometimes with “386” in the corner), you have correctly installed the Squirrels ROM.

If you load the ROM and the screen stays white: