[Q] OTA Manual Update advice please

Hi Guys,

I have an unlocked One Mini which apparently works in all European countries. At the moment its on 4.3 but I found an OTA file online named "OTA_M4_UL_K44_SENSE55_MR_HTC_Europe_3.10.401.4-2.12.401.1_release_351632.zip" which apparently is the update to 4.4.2

As best I can, I have cross referenced the phones build.prop with the updater script in the OTA and the relevant versions / model id seem to match. I also found instructions online about how to apply it. A couple of questions:

Could someone more knowledgable than me please confirm which items I need to match up in both files, so I dont make a mistake?

How do I access the recovery menu itself once recovery starts?

I need to leave it stock for warranty purposes, and I underfstand applying the OTA wont void warranty. Am I correct?

Thanks in advance

No one have any ideas on this?

To answer my own question, I spoke to HTC yesterday, it is the correct update for my phone and installs fine