Stuck in boot loop after trying to update to El Capitan.

I have a 27” iMac Mid 2011

Stuck in boot loop after trying to update to El Capitan. No keyboard function.

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crwdns2889612:0crwdne2889612:0 0

crwdns2942205:01crwdne2942205:0:

Do you have a USB keyboard, you'll need that to get into your system.

See if you can get into Safe mode pressing the Shift (⇧) key.

Reference: Mac startup key combinations

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