Likely part of the software version or manufacturer code.
: Often host dumps for Chinese universal boards. Download ATM20 PB819 1366x768 REF35 rar
: Open your device and verify that PB819 is printed directly on the green circuit board. Likely part of the software version or manufacturer code
: Ensure your screen panel is actually 1366x768 . If you use this file on a 1920x1080 panel, the display will be distorted or blank. Download ATM20 PB819 1366x768 REF35 rar