Do NOT skip this step. Open your MX9 unit (or look at the bottom sticker) and check for:
The is a popular budget streaming device, often powered by the Rockchip RK3229 or RK322X chipset. While these devices are versatile, they frequently encounter software bugs or performance drops that require a verified firmware flash to resolve. Why Flash Verified Android 7.1.2 Firmware? firmware tv box mx9 4k android 712 verified
If your box turns on, you can install the "Aida64" app from the Google Play Store to see the exact motherboard model (e.g., PCB board: M201D or MXQ-V3). Do NOT skip this step