How to clear cache partition from stock recovery (un-rooted phone)

[EcoClipse]

This method posted by bikercr worked perfectly on my HTCd-626. Be prepared for the 3 button press after selecting recovery. Almost immediately there is the HTC logo with white background then blank. Press all 3 together and release. Then repeat. I got it on the 2nd repeat. Wiped the cache.

 

[EcoClipse]

Just to clarify, you are saying this method works for you on the Verizon version HTC One?
I ask because once you scroll to recovery and hit the Power button the phone reboots immediately showing the HTC logo. There is no "Blank, dim screen".

 

[EcoClipse]

Yes it worked perfectly on my stock HTCd-626. Prepare for the 3 button press once you select recovery. The HTC logo appears for 2s then blank. Press all 3 together and release. Repeat. I got it on the 3rd go.