TuT [Tutorial] Changing your UDID in iOS 8

t0r · August 30, 2015

Hi guys,
since from iOS 7 there is no updated version of UDIDFaker, I thought it could be useful for you all to know how to change your UDID.
Please note that you are not going to change it on a per-app basis.

So we all know we can change our WiFi MAC Address by editing the NVRAM, and we all know the pain you could encouter after changing it, like apps crashing, iMessage not working, and so on.

So I thought about changing the Bluetooth address instead, which is part of how your UDID is generated.

The first problem I faced is that I didn't know the key for that. "wifiaddr" is well known, but the bluetooth key was still a mistery to me, so I used the logic and tried "bluetoothaddr" but didn't work. Finally the right key was "btaddr".

So I just wrote down the original address of my bluetooth chip and then ran via SSH:
nvram btaddr=anewmacaddress

Then I restarted my iPhone.

It went through the activation screen (the one you get when you turn on your iDevice for the first time), connected to my WiFi network, inserted my iCloud details (because of Find My iPhone) and everything went fine.

I checked my Bluetooth address in the Settings app and it changed.
I checked my UDID in Cydia (at the end of the Cydia welcome page) and with "AboutMore" (downloaded from Cydia) and it was totally changed.

After that I immediately checked my apps. Everything was there. Progress in games and data in apps were still there. I only had to re-link my device to my Cydia account, as it was seen as a new device.

You may want to delete the old key from the keychain file if you want to get unbanned from games, but I didn't test that.

That's it. Hopefully this will be useful. I achieved what I wanted to do

t0r