It seems like something went wrong while resetting and the process was not executed as it was supposed to be. Do not worry, by simply applying factory default reset, you would be good to go. Follow the given instructions carefully:
Factory default Reset:
Step 1: First, unplug your Airport router from its source of power and then press & hold the reset button unless mentioned to release it. Please note that you need to keep holding the reset button for some time.
Step 2: Now plug back your Airport router into the AC power outlet while holding the reset button as mentioned in the previous step.
Step 3: Keep your fingers pressed on the reset button until the light blinks green for four times. The process will hardly take more than a few seconds.
Step 4: Once you see the blinking green light four times, release the reset button as you have successfully completed the hard factory reset of your router. Now all the faulty settings causing the problem has been eliminated and your router is in the same form while you configure it for the first time.
Note: You need to reconfigure your AirPort router from scratch as all the settings have been wiped out. During the process of factory reset you won't be able to see your router in the AirPort menu as you mentioned about the Hard reset. once the factory settings have been configured you will be able to see it.
Hopefully, these steps helped you in resolving the issue. in case you have any difficulty regarding the steps feel free to reach back and I will be glad to help you out.
Blinking amber means it's not configured right or not configured at all.
Could also just be a warning message.
Connect it to your computer with an ethernet then use the airport utility to FACTORY RESET it from the Apple Menu Bar.
Then remove the ethernet and use your WiFi to pick it up again and re-set it up from scratch.
Airport express not responding after reset?
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