Nexus 6P nethunter upgrade issues

Device - Nexus 6p
Android version - 8.0.0
Nethunter version - 2019.2

Linux kali 3.10.73-angler-nethunter-3.0

I want to upgrade to latest version of nethunter as of now , I tried it via terminal using command


apt-get update && apt-get upgrade

some files were downloaded & i got an error.

Can I upgrade to latest version of nethunter by flashing via TWRP ? Is it safe method ? am worried I may encounter a boot loop or brick device.

Kindly suggest me a suitable method.

Regards
Rowertwins