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Hi,
When I go in settings -> about the device -> diagnostic, it's written s/o after the version number of the OS (see screenshot).
What does it mean ?

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Thank you for your response.
So that why I can't update to Lolipop? Do you know how I can remove the "s/o"?
I had 3 users profils on my tablet but I removed 2 of them and I still have the "s/o".
Does Pc Companion say you have an update and the letters s/o can also mean a Linux coding reference which is a way of directing comands a bit like on a Pc you have .dll files which if become corrupted can and will stop programs etc from working
PC Companion says that my tablet is already up to date
If Pc Companion says you are upto date then either any potential or otherwise updates haven't been released for your model, for your country or your network hasn't authorised the update for release