Hi everyone:
Here is the answer from the Fairphone support team regarding this upgrade not available on the French network SFR:
Unfortunately with the latest update, there were issues with compatibility and the SFR network infrastructure.
Therefore they have not pushed the update onto its users. They fear that there maybe be connection issues if done. They are the only carrier in Europe to have this issue, and we are looking to resolve this with our next update. We apologise for the delay, and thank you for your patience!