[Asus  Eee Pad Transformer Prime] UN Owen:
I'm back with the same problem that sent me down a 17 hour rabbit hole. Having done a COMPLETELY fresh install into Katshmallow follow instructions down to the T from [ROM] [MM 6.0.1] KatshMallow v29 [TF201], I once again have coming across the bug mentioned in the Title. Because I'm lazy, I'm going to copy-paste the section from my other thread about this specific issue here:

I put a total of a couple or so hours into researching this and easily found others having the same issue, albeit not specifically to the exact ROM and device in question. I also tinkered a bit in these hours, reflashing and rebooting and all that jazz. I eventually settled upon one of three conclusions:

The "/persist" folder had gotten deleted which contains vital wifi/network configuration data

wlan0 was borked on a hardware level and I managed to completely kill an hope of wifi on my device

There was a MAC address somewhere that I needed to manually edit (that WASN'T in the persist file)

Considering the fact that I could not see nor change directory via adb terminal (yes, with su) into a "/persist" folder, and that the hardware-broken devices other users had were most if not all cellphones, I pushed on ahead assuming #1 to be my problem. ("See" includes dropping and installing a file explorer onto the tablet as well.)

With this is mind, the next course of action was to somehow get this "/persist" folder back.

The problem goes as follows:

Android: Fresh boot in Katshmallow, Choose English, Turning Wi-Fi on..., hit back, hit forward, MAC 02:00:00... *after some time* Turning Wi-Fi on..., hit back, hit forward, blank screen. (skip is greyed out for all of this)

Reboot, select English, Turning Wi-Fi on..., now able to SKIP, Skip Anyway, adjust Date&Time, select google services, enter home screen. Go into settings, Wi-Fi, Turning Wi-Fi on...

On computer: cmd, adb shell, su, cd /, ls ... no /persist folder

Google time, saw this. Okay.

Android: Reboot in recovery, wipe>factory reset, boot system

Back to Google, saw this and figured I let things cook for awhile. 15 minutes later, nothing.

More google, saw this

Android: reflashed ROM and SU after usual wipe (NOT GApps), booted, didn't touch anything just let sit for 15 minutes again, rebooted in recovery, flashed GApps, booted, setup wizard and google play services continually crash, fixed the former with this video, didn't fix he latter before trying Wifi, turn off using network to manage time as advised here, rebooted, some more apps downloaded during boot (weird...), issue persists, delete wpa_supplicant (which I doubt was an issue anyway), reboot, issue persist, factory reset because play crashing constantly is annoying, reboot, reboot again (can't skip setup unless I reboot)

Google, this, downloaded, dropped, and installed Macman, stuck "loading" after being granted superuser.

So yeah... wifi isn't working. This seems to be the only post that I have yet to try, but cannot as there is no "/persist" directory to speak of.

Anybody know anything about this stuff?

Update: ran ifconfig, showing lo and dummy0 interfaces. wlan0 is in sys/class/net/, working with busybox and some other threads to further diagnose. Note: I know nothing about what the problem might be. (ie nothing about network drivers and stuff).

Ran again with busybox, output (the HWaddr seem legit so I chose to blank them out):