You can often change the resolution or boot logo via the Service Menu by pressing Input + 2580 on your remote.
Place the firmware file (often allupgrade_338_xxx.bin or similar) into the root directory of the USB—do not put it inside any folder. Update: Power off the TV. Insert the USB drive into the TV's USB port. Download CV338H A50 1920x1080 USB Tested part01 rar
If your Smart LED TV is stuck on the logo, restart-looping, or showing the "Android process has stopped" error, a firmware refresh is likely needed. This tested software specifically supports the mainboard with a Full HD (1920x1080) panel resolution. Mainboard Specifications Model: CV338H-A50 (Smart Android 3-in-1 Board) Resolution: 1920 x 1080 (Full HD) Operating System: Android Memory: Typically 512MB/1GB RAM You can often change the resolution or boot
Release the button once the "Software Upgrading" progress bar appears on the screen. Insert the USB drive into the TV's USB port
This download contains the (rar format). File Name: CV338H_A50_1920x1080_USB_Tested_part01.rar Installation Instructions (USB Method)
Do not power off the TV during the update process, as this can permanently brick the motherboard. Download Link [Insert Your Link Here]