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Do not turn off the power during the update process.
Disclaimer: Firmware flashes are done at your own risk. Ensure the main board ID ( MSD6A638-T8E2 ) matches exactly before applying. Download MSD6A638 T8E2 Toshiba 43U7750 170207 zip
To make sure you get the exact right file, could you tell me: Do not turn off the power during the update process
If it's for a fix, I can try to help you narrow down the best version of this firmware. won't turn on
What is the with the TV (e.g., won't turn on, stuck on logo)?
Usually, the file is placed on a FAT32 formatted USB drive, which is then plugged into the TV, and the power is cycled while holding the power button or menu button to initiate the loading process (sometimes known as MstarUpgrade.bin or similar).