Solution: Try another USB port. Some STBs only recognize USB 2.0 ports. Also, ensure the reset button is functional. Use a multimeter to check continuity if necessary.
Solution: Corrupted download. Re-download the V2.1.0 file, verify checksum, and repeat. Also, try a different USB drive (older, smaller capacity drives work best). Stb Erom Upgrade V2.1.0
However, respect the process. Read the manual for your specific STB model. Use verified files. And never, ever interrupt the power during the upgrade. With caution and this guide, you will successfully transform your STB into a more responsive, secure, and versatile media hub. Solution: Try another USB port