I ordered my X5105 from Radioddity about the second week of June, 2020.? They had been on special a few days before that, but I missed it.? And then they were out of stock when I did get my order placed!? The radio arrived at my QTH on June 25, 2020, and must have been part of a new shipment.? It did come with V3.0 firmware.
On the back of the radio is a sticker with the serial number X0301546.?
I expect that someday there will be questions about model/unit variations over time and different production runs.? So this may help in the future as a reference point.
Doug, K8RFT
