A:AnswerNo if you do you'll have to use version 10.2.2 or lower and yes you can upgrade the SSD if you want to (would recommend a nvme ssd though it might require upgrading the boot rom to at least version MBP111.0142.B00)
A:AnswerThis is not certified by Apple. They certify for 1 year. A 2017 version is available refurbished from the apple.com web site. So about $200 more for a model 3 years newer.