This is the only way to fix the *no-support-for-this-app-on-this-forum* black screen problem for both back and front camera. You know that mi6 and mix 2 had that same kernel. For me and my mix2 worked like a charm. Just flash it and Google cam Hdr + mod will work as it should be like 8.2.1 rom...
Furthermore in the last apk by...