Mini 2 firmware and DJI App on 1st use

just got a refurbished mini 2. Can i update the firmware and register it on litchi or do i have to install DJI FLY? i would like to completely avoid DJI Software if possible

No, have a look at this thread:

THANKS. I used litchi with a P3 Standard for a while. Back then there were firmware updates that would cause problems but I guess that is a thing of the past and i need to install all updates?

You may want to read the release notes before updating the firmware:

Thanks.Been a few years since i used Litchi and was hoping it would be a bit easier