No suitable DTB after upgrading to dragonboard-820c-bootloader-ufs-linux-42

I get this:
[260] ERROR: Unable to find suitable device tree for device (312/0x00010001/0x00010018/0)
[270] ERROR: Getting device tree address failed
[270] ERROR: Could not do normal boot. Reverting to fastboot mode.

Looking at skales, it looks like it doesn’t even has a suitable entry for platform=312.

What am I missing ?

Edit: changing skales 8096 entry to 312 solved the issue. was the platform ID changed ?

Don’t know about this issue, but, It’s no more required to use skales.
You can just create an image with the original DTB (append DTB to kernel gz), in the same way as for the DB410c: