Hello, I bought a dso2d15 in 2021, which worked well, newer software improved its operation. But when I uploaded the last one (2024-05-07, the firmware changed to 3209), I haven't been able to calibrate since then and it says error 511d1! I loaded firmware (3202 and 3208) and older software, but nothing changed! Do you have any idea what I should do to make it good again?