I have tried to install it from the latest official 15.1 daily (20190226) + 8.1 opengapps + encrypted storage.
I applied the official directions, plus 9.0 opengapps in particular:
> Please note that if you’re currently on an official build, you DO NOT need to wipe your device.
The system kept on booting to bootloader.
Then I have tried to restore my latest complete backup. It started bootlooping without asking for the encryption PIN.
I wiped everything and installed 16.0 from scratch + 9.0 opengapps. No way.
I ended up by reinstalling everything from scratch.
I warned you.
I applied the official directions, plus 9.0 opengapps in particular:
> Please note that if you’re currently on an official build, you DO NOT need to wipe your device.
The system kept on booting to bootloader.
Then I have tried to restore my latest complete backup. It started bootlooping without asking for the encryption PIN.
I wiped everything and installed 16.0 from scratch + 9.0 opengapps. No way.
I ended up by reinstalling everything from scratch.
I warned you.