Upgrading raid firmware messes with drive data?

I need to upgrade both 1.5.0 controllers on one of my x raid so that later I can use then on a second x raid with 750gb drives. the second x raid is having lots of problems losing connection to a xserver and I need to pinpoint to see if it is a controller problem.
the question is. upgrading the 1.5.0 controllers to 1.5.1 messes with the data and settings on a simple raid5 on both sides of the raid storage? I don't have the time and mainly space to backup the data.
thanks.
Nuno

No upgrading the controller firmware doesn't affect the drives/arrays or data.
That's not to say you shouldn't have a viable backup of your data, but it's not a prerequesite for updating the firmware. :)

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