Update (14July 2019)
Hey guys
I visited service center for hinge problem.
I asked them about the M.2 SSD slot. They said this laptop doesnt support it.
I am having three year accidental damage protection plan.
If i add ssd myself warranty will be void.
What could be done in this case.
Usually warranty terms is something like user can perform any upgrade but warranty will be void if user damages something while doing so. Most customer care people blatantly lie, especially the ones to talk to via phone, chat or in-person. Ask about it in HP community forums, some HP employee will give you the real thing.
I bought an HP laptop for my uncle which had screws under rubber feet (it wasn't an ultrabook), a scare tactic. But before purchase HP support on phone & chat told me it will void the warranty, whereas in HP forums many mods have stated what I said. I think they are just trying to fool normal people & since forums are used by people who are above the normal population, they try not to fool them as it can lead to some lost sales.
definitely not. Best you can hope is that at least they will charge you the "minimum standard diagnostic/servicing price" which is there for laptops out of warranty & is used for determining the final repair bill.