Press and on the TV chassis (not the remote control).
Ensure the downloaded file is typically in a .bin or .img format, often compressed inside a .zip or .rar archive. Step-by-Step USB Installation Guide Hk.t.rt2841p638 Firmware
Last updated: October 2025 – Firmware versions and tools may have changed. Always verify checksums (MD5/SHA256) of any downloaded file. Press and on the TV chassis (not the remote control)