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Wonder whose responsibility it was to update that, O2 or Ericsson.

Ericsson generally offers managed services, and so it's likely it was their responsibility. Also, this is reflected by O2 seeking damages.

It apparently only effected a new software release - so its down to Ericson in this case.

This is supported by the fact that Softbank in Japan experiened a similar network outage at the same time. They too blame Ericsson.