: Some performance issues require updating the Microcontroller Unit (MCU) specifically, which can sometimes be done through a separate "MCU Upgrade" button in the "About" or "System" menu. Critical Precautions Yt9260-ver1.1 Firmware [work]
Go to Settings > System > About and take photos of the Kernel version and Build number. yt9260-ver1.1 firmware
YT9260 – PCB Version 1.1 only Do not flash on VER1.0 or VER2.0 unless specified otherwise. yt9260-ver1.1 firmware