While holding the Reset button, connect the USB Male-to-Male cable from your PC to the (the one closest to the SD card slot) on the TV box.

The is a specific software update designed for MXQ-branded Android TV boxes, typically those running on the Rockchip RK3228A processor. Key Technical Specifications

The string R29 Mxq Lp3 V2.3 is . Do not flash any file claiming to match it without:

The alphanumeric string printed directly onto your blue or black printed circuit board (PCB) identifies the specific hardware layout of your device.

Ensure you have installed the Rockchip Drivers correctly.

Wrong driver subsystem packaged within the selected firmware build.

However, keep in mind that these budget boxes often have hardware limitations. If the V2.3 firmware is based on Android 7.1, you may find that some modern streaming apps (like newer versions of Netflix or Disney+) may not run in HD, as they require newer Widevine DRM certifications often found in Android 9.0+ or certified devices (like the Chromecast or Fire Stick).

Ensure the TV box is completely unplugged from its power adapter.