> You have been told by email the recommended recovery process.
And I appreciate it. Unfortunately, it didn't work, but I am grateful you took the time.
> For the SD card recovery you are now forced to do on this old unit not supporting USB recovery the costs are to open the unit, recover it and perform a recalibration.
Yes, it is unfortunate that Siglent didn't ship this simple, obvious feature from the beginning. Be that as it may, we are here now and my option is this one (SD card, re-calibrate) or purchase a completely different meter (I won't buy another Siglent at the moment) so I'll give this a try.
If anyone can let me know the process, that would be awesome.
Ken