R29 MXQ LP3 V2.3 is a specific motherboard revision for the popular MXQ Pro 4K
This usually means the firmware version doesn't match your NAND flash memory. Double-check that your board actually says "V2.3" on the green PCB. r29 mxq lp3 v23 firmware top
Finding official firmware for these boards is rare, so the "top" choices are usually community-verified ROMs or backups from similar stable devices. R29 MXQ LP3 V2
Netflix may stay at 480p due to missing Google Widevine L1 certification. That is a hardware limitation, not firmware. Alternatives to V23: What About V24 or V25
V23 TOPOLOGY INITIATED. WELCOME, ADMINISTRATOR.
To help your PC recognize the TV box in "Mask ROM" or "Flash Mode". Rockchip Android Tool: The software used to push the firmware to the device. USB-to-USB (Male-to-Male) Cable: Required to connect the box directly to your computer. LibreELEC Forum Step-by-Step Flashing Instructions