The 3.19 fw wouldn't downgrade for me.I have Joyeauto "own" 03.19 firmware (4.89MB) downloaded from their website. I'm about to try to downgrade to see if I can return to the Carlinkit firmware later.
I am afraid to leave it useless and as they have said version 08.27 is also good for me.
I just ended up shipping mine back with it being stuck on 8.27. I could only do very basic usage which was laggy and I didn't want to wait too long to return it. Waze or google maps would constantly crash it. I think it was overall worth tinkering with for the return shipping (china).
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