How to perfom the glitch:
- Select the class you want to use, and make sure both of your gadget slots say "No Gadget"
- After that, select the class in which you want to use it's gadgets
- Select the gadgets you want to use, then place your mouse cursor back on the class you want to use them with (don't click it yet)
- After this, all you need to do is press "ENTER" and then select your class immediately afterwards
You should be able to have some fun with this at least for a little while before DICE catches wind of the glitch and removes it.
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*Update - DICE has found out about the multiple class glitch, and will be removing it in the big September patch.