Zidoo introduced a new system library libzidoomusic2.so with Music Player v6.9.3. I’ve copied libzidoomusic.so and libzidoomusic2.so from firmware Z9X v6.0.60 to my Z9S and it didn’t boot anymore. I’ve had to recover it.
Music Player
Zidoo Music Player v6.9.22 – McBluna.net
With the 
beta firmware v6.0.90(_G) Zidoo updated Music Player to version v6.9.22.
I’ve created a modded APK for the Android 6/7.1 devices.
Zidoo Music Player v6.7.6 – McBluna.net
With the Z9X/Z10 Pro Beta Firmware v6.0.45 Zidoo updated Music Player to Version v6.7.6
I’ve created a modded APK for the Android 6/7.1 devices based on the Android 9 code from the Z9X firmware v6.0.45_G beta
Modded APKs for Android 6/7.1 devices based on Android 9 firmware
It took me three days to figure out how to create working APKs for the Android 6/7.1 devices based on the Android 9 code from the Z9X firmware v6.0.35.
Update 2020-09-10: Since Zidoo released an update for Z9S with even more current versions of their apps, the use of modded APKs is not necessary for now.
