Hello. Unfortunately, I saw this forum late, there was the same problem with external synchronization. I wanted to check on another firmware, but I did not find a new one, I downloaded it for 2019, but it was not detected, since for this series the firmware is named DS1000Z-EUpdate, and the old ones are named DS1000ZUpdate. But, since my hands were very itchy, I changed the name, the device saw the firmware and was sewn. Everything works normally, the problem with synchronization remains and a new one has appeared - now I can not reflash it back: he now does not see the previous firmware (with the name DS1000Z-EUpdate), the renamed one starts to flash, and somewhere in a minute the process is interrupted. Help from the Chinese was in the form of a new firmware for this year, but, of course, it also does not come in. Do I have a chance to fix this somehow? Thanks.