After installing the latest version, I opened it up to find the options for downloading the instructions, opted for English.

It then complained that wget was not installed, and then unlocked/removed some folder related to dpkg or perhaps something else... (forgive me, I can't remember which one.)

Then I found that all my contacts and messages gone! Completely wiped.

I finally managed to restore my contacts but deleting and re-entering my Nokia account from the phone - my contacts were synced there. No idea about my messages - I don't even think they're even possible to restore, but any ideas would be appreciated! I am still receiving and sending texts normally now, I have just lost everything prior to this.

So is this a bug with N9 QTweak or just a coincidence for me?