This community often shares All Resolution Upgrades

A direct USB Firmware Bios Bin is hosted on a Google Drive link via this forum.

Press and hold the button on the TV while plugging it back in.

for related boards like the CV338H-C42, which can sometimes be cross-compatible if the panel resolution matches.

" firmware; search their site for the specific 1366x768 Zephir variant.

Because these files are often split into multiple RAR parts (like the "part1.rar" you're looking for), you must download (e.g., part1, part2, etc.) into the same folder before you can successfully extract the .bin or .img file. Where to Find the Download

Use a FAT32-formatted USB drive (ideally 4GB or 8GB).

Release when the standby LED starts flashing rapidly, indicating the update has started.