Build.prop permission boot problem is a generic android issue. I added how to go back into recovery specifically for HTC M8 since that was another hard to find solution also in order to fix the build.prop issue. Just being helpful since this solut...
I just want to share how I accessed recovery mode with the same build.prop issue but with S-ON (might work with S-Off too).
I found the solution from here:
Before you mess around i suggest to read up on terms and issues you might stumble on ! Learn adb/fastboot commands to the bone and then start all the rooting stuff.
Phone on :
Hold power + volume up, when the screen turns black (the reboot...