Yes. And if Firmware finder doesn't want to flash you can use this:
https://xdaforums.com/mate-9/how-to/guide-mate-9-flash-update-package-t3593108
If you updated to B172 through OTA you should be able to install at least that using Firmware Finder. But as you said, you need stock recovery for it so flash stock recovery first (using fastboot).
If you use the Flash guide you can install B189 right away.
do I have to unroot first or directly flah recovery stock (using fastboot) and does FF works if the bootloader is unlock?
why do you think i did loose the camera after fashing the boot image that you gave me? would it be back if I just flash another boot image?
at the moment this is my situation:
- impossible to do factory reset from phone settings (FR just doesn't start and any message popup appears).
- format data from TWRP works but I get few app and no camera.
- I repeat the eddmecha root procedure but still no camera and during flash I get a few red “unable to mount storage” message.
- I tryed to flash your boot image and even a different one that I found from virtyx but still no camera and no factory reset available.
-even after flashing vityx boot.img of after any restore of my full backup (boot included) I get the ANDROID write logo during boot