Did you type: lspci > /sdc1 lspci.txt exactly like this? because that would pipe the output into /sdc1. You probably want to pipe it into /your/mount/point/lspci.txt (something like that).

how do I install rpm fusion repos on debian? I only found instructions for fedora and rhel https://rpmfusion.org/Configuration

Stop. You do not want to do this.. While resources published on other sites may be full of information, that information is not always relevant to you. Don’t blindly follow bad advice.

The “rpm” in “rpmfusion” refers to the filetype that Fedora’s built-in package management system, dnf, uses.

You want to use Debian’s builtin package management system, apt, which uses the “deb” filetype.

Here is an explanation of how to add Debian’s “non-free” repository

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Do not follow information for other distros unless you know how to extract the bits that are relevant to your distro.

In general, I recommend following the advice from Debian’s wiki or website, then debian’s forums if you can’t find anything there, then debian specific forums elsewhere, then other distro’s wikis, then any other site in a last-ditch effort.

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Now that you understand the “why,” here’s the “how”: go back to Debian’s download website and download the appropriate installation image from the bullet point that says

A larger complete installation image:

Reason being: the smaller “netinst” images are made to work generally for most people who can plug their computer into ethernet. It’s made to only use the bare minimum of disk space and get the rest of the files it needs from the internet (the “net” in “netinst”).

You need the installation image that come with the “drivers” (firmware) for your WiFi card already on disk, which should automatically detect your device, find the correct firmware for it, and set up the non-free-firmware repository for you.

If that doesn’t work out for you, you can try manually installing using the guide on Debian’s own wiki, which I found by searching for your wifi card BCM4360

ETA: how do I install rpm fusion repos on debian? I only found instructions for fedora and rhel https://rpmfusion.org/Configuration

You don’t. rpmfusion is a repo for rpm based distributions. Debian is not rpm based, but deb based. There might be PPA’s for Debian instead.

As the unfortunate owner of a same-gen MBP with the same wireless card, you’re looking at using the proprietary driver (I at least never had any luck with the open-source ones). Luckily, Debian do support those, and even have wiki page for them: https://wiki.debian.org/wl

Does require some extra configuration though. If you happen to have a Android phone, you should be able to use that for USB-tethering to have internet access on the device you’re installing on, will make the process a lot easier (you don’t even need a SIM in it, you can tether your wifi, that’s what I ended up doing 😅).

Broadcom is one of the worst companies when it comes to proprietary Wi-Fi cards. Use the non-free Debian ISO - but that still won’t guarantee if the installation would be a success.

Quoting from nonguix:

Some Broadcom wireless hardware requires a proprietary kernel module in addition to firmware. To use such hardware you will also need to add a service to load that module on boot and blacklist conflicting kernel modules:

(use-modules (nongnu packages linux))
(operating-system
 (kernel linux)
 ;; Blacklist conflicting kernel modules.
 (kernel-arguments '("modprobe.blacklist=b43,b43legacy,ssb,bcm43xx,brcm80211,brcmfmac,brcmsmac,bcma"))
 (kernel-loadable-modules (list broadcom-sta))
 (firmware (cons* broadcom-bt-firmware
                  %base-firmware))
 ...)

This quote is relevant to Guix, but you get the idea.