I bought a Note 4 last year in the UK on eBay, and it was a US verizon version that came, so I had to get it rootedfor it to work on my UK giffgaff sim card.
But now 8 months on, all root checking apps say I am not rooted? But my device status is still custom and I can't get OS updates.
Read more: Why has my Galaxy Note 4 suddenly lost root?