Relevant stock rom

Hello everyone. I want to unroot my phone but i can`t find relevant ruu file. here are details:

version-bootloader: 1.57.0000
version-baseband: 4T.27.3218.14
version-main: 5.12.709.103
version-misc: PVT SHIP S-ON
product: m7_u
platform: HBOOT-8064
modelid: PN0711000
cidnum: HTC__621

thank you