How do I do a factory default reset. Nothing in manual been all over menus can't find a factory reset?
According to siglent:
Oscilloscope Hardware Reset
1. Disconnect all USB, LAN, and input cables. ...
2. Power cycle the instrument by pressing the power button.
3. Immediately begin pressing the MATH button repeatedly at a rate of 2 to 3 times a second while the instrument boots up.
4. If the instrument does not boot up properly, retry steps 2 through 4.
HOWEVER, i don't see a need to do this, and i'm not even sure this is the kind of reset we're looking for. This may completely reset the license keys to factory default also. When i upgraded my SDS-812X HD to an SDS-822X HD (100MHz -> 200MHz) last night, i rebooted normally, used the default button, then ran a self calibration as the scope had been running for over 30 minutes. I have had no issues. My scope identifies as SDS822X HD, has the upgraded memory (and wave form capture rate i suppose?). Those reset instructions are for "In some extreme hardware errors, the oscilloscope may become unresponsive or “hang” during the boot sequence."
https://siglentna.com/operating-tip/oscilloscope-hardware-reset/