Pinebook update from 8.99.50

[Ron Georgia <netverbs%gmail.com@localhost>]

I apologize if this is a duplicate request. I did search the archives but came up empty. I have a Pinebook which is running 8.99.50 (and very nicely I might add). I downloaded the latest image from invisible.ca. Now the question. Is there a way to upgrade the system to say 9beta or even current or do I need to overwrite the eMMC card and "start over?"

If I remember correctly I can:
1. use sysupgrade utility
2. download the latest kernel and sets for aarch64 and untar them (except etc and xetc). 
Say from here: 
http://nycdn.netbsd.org/pub/NetBSD-daily/netbsd-9/latest/evbarm-aarch64/binary/sets/
http://nycdn.netbsd.org/pub/NetBSD-daily/HEAD/latest/evbarm-aarch64/binary/sets/

Is this correct?
 
Ron Georgia
“90% of my problems are due to ignorance, the other 10% is because I just don’t know any better.”