Originally Posted by markhutchison
Hard to say if using someone else's service books would work but you would have the best success if you were able to aquire the service books that are from someone using the same Carrier/Device as yourself.
Yes, I know, though I wanted to try a few things out, like one would be replace the service books with the provided backup, then update the service books given through my provider by registering again (in hopes that it doesn't remove the additional service books).
I have absolutely no idea if that would work, but I guess if you don't try you'll never know
If all fails I'd just put back my service books from a previous backup.
(all in all, I doubt to find someone on these forums from switzerland using swisscom as a provider and a working GT, but that's just me