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The backup dump is a .bin file usually compressed in a .rar or .zip archive. This is a copy of the software extracted from a working TV's memory chip.
Plug it into the TV's USB port (use a USB 2.0 white port if available). Download S506 PB801 HISENSE LTN40D50EU Backup Dump rar
Load the downloaded .bin file into your programmer software and write it to the chip. The backup dump is a