Official firmware for these universal boards is rarely hosted on manufacturer sites. Instead, look for resources on professional repair platforms:

Before downloading any files, you must verify that your board matches the specifications exactly. Installing firmware meant for a different panel resolution or audio configuration can permanently brick your device.

: Check the support section of your device's brand website using the full model number of the device, not just the board model.

Non-Smart (Standard LED) or Basic Android Smart TV Setup 2. Pre-Requisites for a High-Quality Firmware Flash

The board was swapped into a new panel, resulting in a distorted, upside-down, or solarized image.

To ensure a high-quality installation, prepare the following tools before downloading the files:

: Ensure that the model "Cv920-e42" refers to the correct device you are trying to update or fix.

If you provide more context about the device or the manufacturer, I might be able to offer more specific guidance.