Also while your i Phone is on, pop the Sim card out and turn off the power.
Here are their comments on the matter: There’s an error in the bundle for the i Phone3GS 4.1 that prevents the new baseband from being used.
No outward-facing changes or new features were discovered during the beta testing process, suggesting the update focuses on bug fixes and performance improvements.
Don’t worry though, we’ll list all the devices that are allowed to install i OS 10 later in this article, as well as offering advice on whether each device is powerful enough to run i OS 10 without slowing down.
Unluckily, they were using an old i OS version and no longer activated.
Activation and upgrading require i Tunes, which runs on Windows, but I sadly run a linux machine.