HTC Desire 626s on Eastlink

I have a HTC Desire 626s on Eastlink and its unlocked and rooted but my mother would like the root removed and back to stock. I cant seem to find away I can do this I have been looking for a few hors and I'm not sure what RUU file I need.

Here is information I know about the phone:
DOWNLOAD MODE:
htc-a32eul PVT S_ON
OS-1.24.428.4

its on Eastlink service in Canada

please itf anyone can help me thanks

from xda-developers http://ift.tt/2bqG2dB
via IFTTT