I'm still confused by the specifications. Blackview show it as 1080 x 2160. But go on Amazon or ebay and sellers show it as 720 x 1440. So when did it change? And how to you guarantee that I buy a FHD version?

There are really two versions on the BV9000Pro, one with HD screen ond one with FullHD. Almost all in shops should be FHD now. If you are not sure please ask the seller before buying. Sorry for the inconvenience