The downloaded Tiger T1 Mini Ultra software file (usually in a compressed .zip or .rar format, or directly as a .bin file).
and not a different model variation like the T1 Mini Pro or T8 Mini Ultra. Tiger T1 Mini Ultra Software Download- - Google
This means your hardware revision changed. The motherboard inside the "Ultra" was swapped from a V3 to a V5 board in mid-2024. You need to search Google for: Tiger T1 Ultra "V5" firmware The downloaded Tiger T1 Mini Ultra software file