Thanks so much! This also worked for my Eminent EM7680, which previously just bootlooped and kept crashing with 19.3. Here is what I did:
Booted into windows and downloaded NEXBOX-A95X_S905X_7.1_8189_8g1g_171118preview_SD_USB.rar and Tool_USB from that MEGA storage link. I hooked my hacked A-to-A USB cable between my laptop and the USB port closest to the SD card reader. I started the USB tool and held the reset while powering on the box. Then I could download the fie aml_upgrade_package.img to the box and in about 5 minutes it was done. After a reset of the box it took another five minutes before the Nexbox software was fully loaded. Inserting the SD card and rebooting, coreelec 19.3 was loading up nicely.