Unhappy [Q] OS broken (likely by automatic download of updates) Need to reinstall OS

Iconia A500 Device will not boot. Recovery procedure gives a little ANDY ... followed a while later by a DEAD ANDY.

Is there a recommended OS image file I might use?

Is it possible to re-install the OS from SIM card using the Device ON and Left Volume Down trigger?

Where might I get the file, what must be done in terms of file re-naming, if anything?

The device does not load to the point of being recognizeable by a connected PC.