1920x1080 (Full HD). Firmware for these boards is resolution-specific; using the wrong version (like 1366x768) can result in a distorted or blank screen.
Holding the power button on the TV and plugging it into the wall to initiate the "force flash" recovery mode.
The "REF86" typically refers to the specific internal panel or manufacturer reference used by Vivax for that production batch. Why This File is Needed
This firmware is generally sought after to fix "soft-brick" issues, such as:
The board appears dead due to corrupted eMMC data.