(Common in older Hisense smart and non-smart LED TVs)
When an RSAG7.820 board is stuck on a static boot logo or cycling continuously, standard on-screen menus are inaccessible. You must force a hardware-level flash using this physical button sequence: rsag7820 firmware upd
Ensure the file is in the root folder and named exactly upgrade_loader.pkg . Try alternate USB ports. USB drive partition style or capacity is too large. (Common in older Hisense smart and non-smart LED
If the TV ignores the USB drive and continues to bootloop, review these potential points of failure: you can enter the Factory OSD:
If you need to check your current version or "Clean Chip" after an update, you can enter the Factory OSD: