BootROM chips execute a very brief listening window right at startup. Execution timing must be precise:
Note: "Google verified" means these solutions appear on the first page of Google search results for "bootrom error wait for get stb uart receive" from authoritative tech forums as of 2026. BootROM chips execute a very brief listening window
Open Windows Device Manager and ensure your USB-TTL chip (e.g., CH340) is correctly assigned to a single COM port lower than COM10. BootROM chips execute a very brief listening window
on your PC to ensure your USB-to-Serial adapter (often using or PL2303 chips) is recognized and assigned to a COM port. in the software to the STB's default (typically STMicroelectronics Community Recommended Tools for Repair BootROM chips execute a very brief listening window