You must confirm the panel model (e.g., HV550QUB, CV500U1) matches your TV perfectly, not just the mainboard number. Using the wrong firmware can permanently damage the panel.
If you are downloading a split archive (part01, part02), you need all parts in the same folder to successfully extract the .pkg file. Where to Find the Files Download MT5522S PC822 3840x2160 AKTV4636S part02 rar
Extract the allupgrade_5522_8G_1G_ref56.pkg (or similar .pkg file) from the .rar archives. Copy the .pkg file directly to the root of the USB drive. Unplug the TV from the wall. Plug in the USB drive. Hold the physical on the TV set. Plug in the power cord while holding the button. You must confirm the panel model (e
Since the request suggests a multi-part RAR file, these are usually found on specialized technician forums that require registration or payment: : A reputable source for this board (listed as Skyline MT5522S , but often used for Akai/other clone boards). OneTV-SRT.com : Another potential source for TP.MT5522S.PC822 KazmiElecom : Offers firmware for various panels. General USB Firmware Installation Procedure Format a USB flash drive to FAT32 . Plug in the USB drive