I Just got my unlocked Pixel pro 9 from google and I plan on installing graphene OS.

as of right now it's not on any cellular network, would I need to attach it to my network before I do this or am I able to install graphene then later on add it to my ATT network?

    chaos9900 Its been quite some time, but I believe any network (WiFi or otherwise) will do. Assuming the OEM option is greyed out and requires a network connection to ungrey