At the current time, installing Natty on an Efika MX will leave you with a pretty much unusable state.

When the system pops up the huge box, do NOT click upgrade now. Please click not to upgrade.

There is too much involved with recovering it from an upgrade to Natty, so we urge everyone to NOT upgrade right now.

When a release is ready that is compatible with Natty, we will have a blog post and this warning will be taken down.

Thank you

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Steev Klimaszewski, Genesi USA Inc.
Senior Software Engineer