5GHz wireless unavailable since upgrading E2500 to Firmware 2.0

My 5GHz wireless is unavailable since upgrading E2500 to Firmware 2.0.  I did a complete reconfiguration of the router after upgrading.  Anyone one have any ideas on how to fix this?
Ed

I carefully followed the steps suggested.  I did a 30 - 30 - 30 second hard reset of the router, reflashed the firmware, then did another 30 - 30 -30 second hard reset.  Then I carefully reconfigured the router manually.  Still no 5GHz radio.  I then called Cisco support and they took me through severaltests, configuration checks, and reconfiguration steps.  They agreed that the 5GHz radio was not working.  I will be sending it back for warranty repair/replacement.
I configured my Verizon cable router wireless so I could take the Cisco router out of service.  I don't have the dual radios or the guest channel.
I think I may buy a wireless AP that is rated for small business usage.  I'm not sure the "home user" wireless routers are sufficiently robust for what now is home use.
Thank you very much to everyone who responded with answers, advice, etc.  Much appreciated.
Ed

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