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ENS620EXT - after changing IP address cannot see device and cannot hard reset it

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I was logging into one of our new ENS620EXT units and after finishing the WIFI changes I updated the IP address to 192.168.61.10.  We do this sort of change all the time on our old ENS500EXT units.  

However after doing the reset I am unable to find the unit at the given IP address.  I've quadruple checked my routes and had another person look them over so I'm pretty sure it's not a route issue.

So I try a hardware reset.  I push the reset button in for >10 seconds, release it.  The lights all flash off, then they all flash on, then into various patterns.  During this process I am running pings to 192.168.1.1 and 192.168.61.10.  Oddly enough, 192.168.61.10 does come up for a few seconds:

...From 192.168.61.59 icmp_seq=398 Destination Host Unreachable
64 bytes from 192.168.61.10: icmp_seq=399 ttl=64 time=999 ms
64 bytes from 192.168.61.10: icmp_seq=400 ttl=64 time=0.329 ms
64 bytes from 192.168.61.10: icmp_seq=401 ttl=64 time=0.532 ms
From 192.168.61.59 icmp_seq=437 Destination Host Unreachable...

But then it stops.  The end result on my lights is the Power light is solid red and the 5G light is blinking steadily at a slow rate.

Any ideas?  Does anyone have an exact sequence of steps for doing a hardware reset on this model?
 

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We also have a third radio that I am able to reach and log into.  I'm having trouble getting the hard reset to work for it also though!  

I push and hold the reset button for >10 seconds, release, and it reboots, but then comes up with the existing settings--not the defaults.

There must be something more to the reset sequence than what is described in the docs for other devices...

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Another note, when I was configuring the IP address to 192.168.61.10 I seem to recall leaving the Gateway field blank.  My coworker here said the ENS500EXT used to require you to enter a gateway even if you didn't intend to use it.  Could it be the device is somehow locking up from that?

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Yes I'm running Linux and have two static IPs on the interface: 192.168.1.59 and 192.168.61.1.  

I'm briefly able to ping the device at 192.168.61.10 when I reboot it, and I also was able to do a software reset of a third ENS620EXT device and connect to it just fine at 192.168.1.1.  So I'm pretty confident I have my routes setup correctly here.

The fact is though I have not been able to successfully hard reset a ENS620EXT model yet.

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Just to isolate, try using another computer and disable the wireless adapter on it (if it has one).

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