Always try to backup original flash data if possible.
Do not turn off the power during the update process. Download MSD6A638 T8E2 Toshiba 43U7750 170207 zip
To make sure you get the exact right file, could you tell me: Always try to backup original flash data if possible
What is the with the TV (e.g., won't turn on, stuck on logo)? won't turn on
The firmware for the (using the MSD6A638-T8E2 main board) is a 4K UHD smart TV software package often used to resolve issues like stuck logos, stuck startup, or corrupted system software. Key Features and Details of the Firmware Upgrade: Chassis/Board: MSD6A638-T8E2 Resolution: 4K UHD (3840 x 2160). Type: USB Update/Firmware Flash.
42.5" Toshiba 43U7750 - Specifications - DisplaySpecifications