Just want to mention that I got Astro Go running on this box with Magisk.

The requirement is :-

1. Android 7.1.2 rom tested. The Android 6 did not work suspect due to DRM library issue. Android 6 will get a file format error.

2. TWRP and Magisk. No need to unroot, just install magisk and hide Astro Go will do.

The magisk is the usual magisk, you can use the stable 14.0 version.

The TWRP is the TWRP for amlogic reference design p212 ( link in this thread ). That TWRP works for Android 6. It might not work for other boards.

For me, this p212 TWRP did not work for Nought. That is Android 6 TWRP wont work for Nought.

It seems the Nought bootloader can only boot the Recovery if the kernel in the recovery matches with the one in the boot image. So I created a customize TWRP for the ROM image 2g/16g. Likely it won't work for other ROMs.

If one presses the reset button to boot the recovery on the SD card, if that did not work, it might boot the stock recovery in the internal storage. And the default behaviour of stock recovery is to wipe your data partition (factory reset). I factory reseted my ROM a few times because of that.

A bit long story.

If my memory serves me right, you don't own a m9s pro. You have a mini m8s, which is based on s912.