Upgrading from 8.2 to 9.0 on Pi Zero

Hardware
1

Hello,

I have running ADS-B exchange on Raspberry Pi Zero 2W. How can I upgrade from 8.2 to 9.0 without loosing all stats and settings? I prefer a remote upgrade because I have difficult access to the Pi.

2

I found how to export/import stats and I made fresh install.

How to export/import stats is written here