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When I first upgrade my shielding to 3 bars, I tried powering it up. However it says "Requires System Upgrade". What system upgrade do I need to power this up? I have enough reactor energy so I'm not sure what I need. Do I have to buy it from a merchant?

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up vote 17 down vote accepted

You need 2 shield upgrades for another point in shields, so if you have an uneven number of shield upgrades you need to add one more to actually make use of it.

2 points in shields => 1 shield
4 points in shields => 2 shields

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Ah right, now I see that. I should probably pay more attention =P – The Jug Sep 15 '12 at 3:08
Although if you're a bit low on scrap, don't hesitate to upgrade one at a time, that extra (unpowered) bar can provide a bit of a buffer against minor system damage. – Trent Hawkins Sep 16 '12 at 10:37

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