That’s good to hear. 
So it seems your /workspace somehow got corrupted.
Yeah your saved content should have not been affected by this. the /workspace folder represent only the current “open” scene or whatever you were working on that may not be saved.
No not in particular, but as i said - sd cards are a bit sensitive. So keep an eye out for:
- Power fluctuations. Maybe the powersupply is faulty or your grid fluctuates a bit? If this happens again, try a different powersupply - any phone charger will do or a powerbank.
- Maybe the sd card has an issue. If it happens again, try a different sd card. But only after you tried different power supplies.
- If both of these suggestions don’t help and you still see this happening, please let us know!
Did you for example, remove the card from the device and load content to it from a computer before this happened? I personally never remove the card and only use the USB Storage mode when i need to access the device content.
Regarding Emergency Flashing:
I should have probably explained the process of the emergency flash. You can find it in the manual. Here’s the relevant page:
