Usually, the extracted file (often named allupgrade_638_sos.bin or similar) is placed on a FAT32-formatted USB drive. You then plug it into the TV and power it on while holding the power button to initiate the "USB upgrade" process.
TP.MS638.PC822 , a common dual-core Android TV mainboard supporting 4K resolution. Resolution: 3840x2160 (4K Ultra HD). Download MS638 PC822 3840X2160 REF56 CONTINENTAL part2 rar
The string you provided refers to for a specific 4K Smart TV motherboard, typically used to fix "stuck at logo" issues or software corruption. What this file is for: Usually, the extracted file (often named allupgrade_638_sos