Significant overhaul to the design
- Uses a TI switcher which should be more robust
- Increased input protection
- Change to physical size of the PCB
- Backup programming header is now simply SMD pads instead of holes, as USB-C programming has been bulletproof so far
- Removal of the LED header
- Reduction in the # of broken out GPIO pads
- Improve RF
- Increase annular rings
- Optimize Nets
- A few test points