: Often shares download links for CV358H series boards on their Facebook page or dedicated website.
: Since you mentioned "part1.rar," ensure you download all numbered parts (part1, part2, etc.) into the same folder before extracting. The extraction will fail if a part is missing.
: Power off the TV, insert the USB, and power it back on. Many boards will automatically begin the update, often indicated by a blinking standby light.
Using the wrong firmware (even for the same board but a different resolution like 1920x1080) can "brick" your TV or cause a distorted display. Always verify that the firmware matches your panel resolution (1366x768).