CLI Upgrade not working

[Moors7]

This might help:

Connecting Particle Photon to Local Server on Raspberry Pi Zero W

@nickspiderman This is a known but relatively undocumented bug with the particle-cli installation process. The following should work: $ sudo npm install -g --unsafe-perm node-pre-gyp npm serialport particle-cli

You might want to give npm install -g serialport a shot as well.