Ask about THE USB of TX2

May I ask, TX2 we need to keep a USB2.0 OTG burning port, but also can expand 2 independent USB2.0, 1 USB3.0 (compatible with 2.0)?

USB2-0(B39, B40 pins) is micro port on default board, but it can be paired with USB3 pins to be Type-A port. TX2 can enter recovery mode by grounding force recovery pin and powering on(or resetting) the device. If it is a type-A port, you can flash system image through type-A to type-A adapter.