Press and hold the Power button on the TV (not the remote) and then plug the TV into the power outlet. Keep holding the button until the "Software Upgrading" screen appears.

If you are missing other parts of the download, these resources often host the full set for free:

Insert the USB drive into the TV's USB 2.0 port while the power is off.

Ensure the motherboard correctly communicates with the Samsung display's specific LVDS signaling and resolution. Installation Guide (USB Method)

Configured specifically for Samsung-manufactured LCD/LED panels. Firmware Details & Common Uses

The is a widely used smart Android LED TV motherboard, often found as a replacement board in budget to mid-range TVs from brands like TCL, Hisense, and Skyworth. The specific firmware file you are referencing ( 1920x1080 512MB 4GB Samsung part2.rar ) is tailored for units using a Samsung display panel with Full HD resolution. Motherboard Specifications

Extract all parts of the RAR archive into a single folder. Copy the resulting firmware file (usually named allupgrade_338_4G_sos.bin or similar) to the root directory of a FAT32-formatted USB drive.

Do not power off the TV during the update (takes roughly 2–5 minutes). The TV will automatically reboot once finished. Where to Find the Software