[Q] Recover from failed root attempt thru TWRP?

I tried following guide to root my HTC One XL, but flashing CWM didn't work. It all seemed to succeed in the Command Prompt, but the phone never rebooted and going into Recovery resulted in the message 'This build is for development purposes only. Do not distribute outside or HTC without HTC's written permission. Failure to comply may lead to legal action.'

I tried several different versions of CWM (5.8.2.7, 5.8.3.1, 5.8.4.0, and an interim build from Modaco), with the same result, before trying . That completely broke my phone, and all I could get into was the 'development purposes' screen or fastboot. The actual phone was gone.

After stumbling upon the EndeavorU/Evita distinction - my phone is an Evita - I found and flashed that TWRP recovery. Success!

However, there's no sign of the SuperSU zip. I definitely put it on my phone following the first rooting guide, but either TWRP can't find it or it was lost when I completely screwed my phone up.

Is there any way to get from where I am now to a functioning phone, through TWRP? Searching for 'TWRP tutorial' just results in page after page of 'how to install TWRP', which is the one bit I've actually managed to do successfully so far.

I currently have no phone whatsoever, so things are kinda desperate at this point.

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