I’m stumped. The Beryl is giving you an address in its range, so I don’t understand why .8.1 isn’t responding. A reset should have come up with that as the right place to reach the interface, no matter what.
Maybe try clearing the tablets browser cache.
There is a new stable firmware–3.211–as of a week ago with a new wifi driver. But if you can’t get to the interface it will be hard for you to load with the tools at hand.