https://archive.org/download/rk3228_firmware_pack/GameStickLite4K_v2.1_RK3228A.img.gz
The most reliable repositories are community-maintained backups on Internet Archive and GitHub. : game stick lite 4k firmware link download
If you tell me your (e.g., V5, V2.0, or V8), I can help you find the specific download link for that board. Firmware Download & Features — GameStick Lite 4K