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RAR archive (specifically "Part 07," indicating it is part of a larger multi-volume download). Where to Find the Software
Software for this board is typically hosted on specialized technical forums. You can find firmware versions and discussions on: KenotronTV : Often hosts the exact USB firmware for this TP.MT5522S.PC822
The text you are looking for relates to the for a Polarine 43PU11TC-SM
Updating firmware is risky and should only be done if your TV is stuck on the logo, restarting, or has software bugs.