Keep holding the button until the standby LED indicator light begins to blink rapidly.

Cv338h-a32 is not an application but a firmware or embedded software binary for a specific piece of hardware—possibly:

Copy the main software file (usually named CtvUpgrade.bin or similar) directly to the of the USB drive. Do not place it inside any folder. 3. Flashing the Software

Take clear photos of the board, the sticker near the LVDS connector, and the panel sticker, then post in a forum like Badcaps.net – experts there will point you to the correct software download.

Android (Typically Android 4.4 or Android 7.1 depending on the version) RAM Capacity: 512MB or 1GB Storage (ROM): 4GB or 8GB EMMC Flash Supported Resolutions: HD (1366x768) / Full HD (1920x1080)