By "boot.img" they mean running the "unstuck tool" and flashing the "kernel."
Hope that helps, if you are able to, you can hop in chat and I'd be able to help you better in there.
so I've tried the unstuck tool 209 because there is not one for 210 can I rename 209 to 210?
Ok I ran the unstuck tool installed .85 kennel..
70.24K 48 downloads
does this look right?
Going into recovery..keep my finger crossed..