You don’t need to print out anything. Simply use the returns portal (the "Rücksendung Router" button), where you will receive a free mobile parcel label for DHL. Please keep the proof of receipt from DHL for a long time. 

There is no deposit on routers, so you won't get anything back. If you do not return the device, you will be charged the value of the device as compensation by o2. 

DHL parcels are insured. If the parcel is lost in transit, you will not suffer any damage. Therefore, please remember to keep the DHL proof of receipt for a long time.

Nein, Leihgeräte können nicht  über einen Shop zurück gegeben werden ... mach das, wie vorgesehen, über das Rücksende-Portal 

https://router-retoure.o2online.de/start/app/dashboard

und bewahre dir den Rücksende-/Einlieferungsbeleg gut auf! ​​​​

Hello @Rein_Kieb ,

as has been written already here by blablup and Sächsin, please don’t try and return the hardware by going to an o2 Shop. Please use the online return portal for this, if you do need any help with it, let us know.

Kind regards, Sven

Hello @o2_Sven and everyone else

I'll use the return portal then. I do want to ask how exactly does the return procedure work and can I already aqcuire the shipping label in advance or should I do this on the day that I wish to return it?

Kind regards, Rein

The mobile parcel label is valid for 30 days. 
If you have any questions about the returns process, please read the FAQ provided in the returns portal.

Hello @Rein_Kieb 

Could you already register and return your router via our webpage?

Regards,

Gerrit

Hey @o2_Gerrit

I have registered my return, I will be visiting my local DHL post-office and sending back the router tomorrow. As long as everything works out with the QR on my phone I think i'm good.

Regards

Rein

Hello @Rein_Kieb 

That sounds good, when everything succeeds at DHL keep the return confirmation from DHL until you receive confirmation from us about the return of the router 

Regards,

Gerrit