MKS Robin Nano V3.1 flashing via USB?

Hello everyone,
I have an new MKS Robin Nano V3.1 board. Is there a way to flash the board via USB?
I would like to use a command-line tool (bossac or similar) for this. The onboard media (USB/SD card slot) are no longer accessible after installation.

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-Witbox Printer, Klipper RAMPS1.4 3xTMC2209 (standalone) Leveling BQ MicroProbe,
450W 230V Heizbett (8mm Aluguss PEI Beschichtung)
fast nichts mehr original :-)

-Eigenbau Printer, Marlin 2.1.x autoleveling (UBL)
Druckvolumen 420x276x300 750W 230V, geschlossener Bauraum temperaturstabilisiert, RADDS,
4xTMC5160 (SPI), Wasserkühlung mit FlowControl, Repetier-Server Pi3 usw.

In theory you can use DFU mode

But note in that mode you can easily brick the board or over write the boot loader

This need access to the the boot and reset pins

"But note in that mode you can easily brick the board or over write the boot loader"

Yes, those are my concerns too. That's why I haven't experimented with it yet.

---

-Witbox Printer, Klipper RAMPS1.4 3xTMC2209 (standalone) Leveling BQ MicroProbe,
450W 230V Heizbett (8mm Aluguss PEI Beschichtung)
fast nichts mehr original :-)

-Eigenbau Printer, Marlin 2.1.x autoleveling (UBL)
Druckvolumen 420x276x300 750W 230V, geschlossener Bauraum temperaturstabilisiert, RADDS,
4xTMC5160 (SPI), Wasserkühlung mit FlowControl, Repetier-Server Pi3 usw.