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I had this same problem upgrading a brand new GS1200-5 from F/W V2.00(ABKM.1)C0 to F/W V2.00(ABKM.2)C0 . In my case I was accessing the switch via firefox on a Linux system. The upgrade button seemed to attempt to push firmware (the connected switch port flashed rapidly) but would fail after the 30 second timer finished.…