Factory restore Dockstar - Help needed (no replies)

Hello,
I own a couple of Dockstars that have been running linux for a few years, thanks to this forum tutorials and useful tools.


Now one of the Dockstars is bricked, and I'd like to restore it to the factory software (pogo...?) but I don't know how...
Moreover I can't find a guide with the needed software anymore.

So, could someone help me to restore the original firmware, please?

Thanks!