given that this kindle has 5.6.5, and the latest for the fifth generation paperwhite is 5.6.1.1 according to this amazon help page:
https://smile.amazon.com/gp/help/cus...deId=201064850 , it's either a 6th gen paperwhite or 7th gen paperwhite (I have a feeling it's the 7th gen, but that's just suspicion) it's not running the latest firmware since the 6th and 7th gen are on 5.9.6.1.