So I've been looking into some people upgrading ram on their thingies and thought about the possibility of doing that on my laptop/tablet/hybrid transformer thingy
I ran strings on the BIOS firmware and found the part number of my ram "chips" (which are HP proprietary and don't mean anything meaningful), along with it, there were a few others, meaning the bios might very likely support them just by changing hard strap resistors
These all seem to be 1867MHz LPDDR3
From pics online it does seem to be epoxied in... Thanks HP for making sure the motherboard is not upgradeable, I'll open mine soon to check