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OK, so I was able to re-flash original SSL #84 on a PC with a standard DreamUp 1.3.3.4. Had to do it in two rounds though. First time I had to use Enforcer tool to enable "Flash" button and that round ended up in "File too big" message but eliminated "No CA found". Then during second run everything was flashed without a hitch as DreamUp properly recognised the box and was able to initiate HTTP serial mode and flash SSL. Many thanks to all posters on this site for the valuable information.