DSA815 Downgrade possible?

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I have the DSA815-TG. It is a great unit and I have all of the trial periods counting down (excluding TG of course).
From what research I've done, I am of the understanding that there are a few options to keep these trial counters running indefinitely. Is this correct?

I also happen to have the 00.01.03d firmware. Can I force a downgrade?
If so, how?

I hope I'm not asking a question that has already been answered but....

TIA