iPad mini 2 have an A7 SOC and just 1GB of RAM, Apple removed iPadOS support with anything less than A8/A8X and 2GB.My iPad mini 2 which just got iOS12 added to it Nov. 2018. It was in iOS land for a couple years. Apple finally beefed it up but just yanked it again with iPadOS. I think mainly because it did have not a pencil. Only reason I can think.