HTC M7 - Return to stock - Have lollipop OTA update topic

Hello everyone,

I want to receive the latest OTA update for my M7. I know this is not possible with a rooted phone

I have been reading through this forum since yesterday and could not find a straight forward solution - I could not understand some of the terms used! I even visited htc1guru and found a lot of information, but could not determine which one is good for me.
Information are scattered and are not in one location, and it seem that everyone has his own case, so I appreciate if I can receive some help or if someone can guide me with the steps to be taken. BTW my phone CID is HTC__A48, is this bad?

My phone details are as following:
s-on, rooted, Unlocked
fastboot getvar all
< waiting for device >
(bootloader) version: 0.5
(bootloader) version-bootloader: 1.57.0000
(bootloader) version-baseband: 4T.28.3218.04
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main:
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: <REMOVED>
(bootloader) imei: <REMOVED>
(bootloader) meid: 00000000000000
(bootloader) product: m7_u
(bootloader) platform: HBOOT-8064
(bootloader) modelid: PN0711000
(bootloader) cidnum: HTC__A48
(bootloader) battery-status: good
(bootloader) battery-voltage: 4104mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-6d8a0b9b
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!