Download Android 9.0 firmware for A5X Max TV Box from here or here. Download Android Oreo 8.1 firmware for A5X Max TV Box from here. Download Android Nougat 7.1.2 firmware for A5X Max TV Box from here. Download Rockchip Driver Assistant v4.4 from here and download Rockchip Batch Tool v1.8 from here.
Archive: A5X MAX Android 9.0
Archive size: 847 MB
Model: A5X Max TV Box 4GB RAM + 32GB ROM
Platform: Rockchip RK3328 / RK322H
Image name: mxq_rk3328_d4_9.0_rtl8723_a5xmax_20181128_r1.img
FW version: 9.0.00
Boot version: 2.49
Model number: A5X MAX00
Inside archive: firmware + Android Tool_Release_v2.59 + Driver Assistant_v4.5 + Factory Tool_v1.63 + A5X MAX Flash Guide.docx
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data.