I followed your instructions step by step after the method explained in the first post didn't work (bootloop: constantly showing the moving colored dots of the Google Logo).
first I thought you made a mistake in 1. and 2. because you flash the system not the boot image and the recovery. But I also tried:
1. fastboot flash boot boot.img
2. fastboot flash recovery recovery.img
That didn't make a difference.
However I result in another bootloop where the attached image is shown every few seconds for less than half a second.
Step 6 doesn't seem to work for me as I always get the error "mount ... (e.g. cache) failed" and the whole process failed. I wiped both caches with the advanced wipe. Format data is also showing me the error "mount ... failed" but says succeed in the end.
I attached the fastboot/adb log. Maybe someone can help me. Thanks in advantage
Edit: attached image failed to load