I DIRECT YOUR ATTENTION TO THIS THREAD INSTEAD: https://forum.xda-developers.com/mate-9/how-to/guide-how-to-root-mate-9-decrypt-data-t3569986
It's easier as you don't need to get a decrypted boot image.
Thank you ajsmsg78 for your work on this....
There seems to be a little confusion on how to do this and I've written down how to in many posts now so I figure I'd just write it down in a little guide.
What you need:
Firmware update.zip from http://pro-teammt.ru/firmware-database/
Note: I have only tested this on Mate 10 Pro, so I don't know if it works on Mate 10. Title will stay until tested
Kernel downloads: https://github.com/Ante0/BKL_OREO_EMUI8/tree/master/releases
Source used: https://github.com/Ante0/BKL_OREO_EM...
For rooting/decryption in general, check out: https://forum.xda-developers.com/mate-9/how-to/guide-how-to-root-mate-9-decrypt-data-t3569986
These require TWRP 3.1.0: https://forum.xda-developers.com/mate-9/development/recovery-uno...
Checking logcat when using Dialer and Messages, I noticed it gets a lot of fail to open db which leads to app crash.
To fix it you can do this, requires Magisk:
Note that this will wipe contacts and messages! (contacts should sync again from googl...