[Q] Problem for many - not able to install lollipop OTA topic

As you can see in this forum - many are having problem installing the latest lollipop OTA. What I did -
1 . Unlocked the boot loader
2. Installed custom recovery
3. rooted the phone
4. flashed back the stock recovery so I can install the OTA from HTC.
Nothing more nothing less. Now I am not able to install latest OTA - Phone downloads the OTA, boot in to recovery, starts installing the OTA and than it fails and recovery shows a deadly RED TRIANGLE.
I did thorough research across this forums to fix the issue and I see many people have similar issue.
Available OPTIONS - SINCE my phone is S-OFF so they are limited

1. Flashing the firmware - but coudln't find a firmware which matched my phone's cid and mid
2. RUU - Not sure if I can install it while being S-ON and if yes than which one should match my phone
3. I have lollipop OTA file downloaded and have firmware file inside it. some one suggested get the recovery from firmware zip and flash it. How can I get recovery from firmware zip, file doesnt even get unzipped.

I am currently on -
Software version - 3.29.166.9
cid: VODAP110
mid: 0P6B10000

Any help/suggesstions would be appreciated. Thanks in Advance