: If the loader file is not publicly listed, call or email Hisense support. If you provide your serial number, they will frequently email you a direct, secure link to the exact upgrade_loader.pkg file you need, completely free of charge. How to Use a Hisense Upgrade Loader File
Press and hold down the physical Power button located on the TV chassis itself (usually underneath the frame or on the back panel). While continuing to hold that button down, plug the power cord back into the wall outlet. Keep holding the button until you see an upgrade progress bar appear on the screen. Upgrade-loader.pkg Hisense Download Extra Quality