Default RUU help?

I rooted my HTC One M7 (AT&T) and am tired of playing around. I am trying to get as close back to complete stock as I can. I re-locked my bootloader, I am S-On, I followed all the instructions I could find online, but when I try to use the ruu exe, I get stuck at "sending 1/6". I am not positive if I am using the correct ruu but I am pretty sure. Bootloader says my OS is 4.18.502.7 (4.20.502.1) and the ruu I downloaded is "RUU_M7_UL_K44_SENSE55_MR_Cingular_US_4.18.502.7_R 10_Radio_4T.24.3218.09_10.26.1718.01L_release_3565 65_signed_2" I don't know what I should try now. I have managed to keep myself unbricked but I figured I should ask before I do something dumb. I want to go back to stock so I can receive OTA updates through the phone, and not have any root capabilities. My HBOOT is 1.56.0000 if that makes a difference. Sorry if this makes no sense, as I am new and trying to make sense of it all.

Any help is appreciated and if this is in the wrong spot, I am sorry in advance.