Hello, Using the supplied USB-C to USB cable…
Press and hold the power button, while holding the power button, Connect USB cable to PC, quick press the reset button, hold the power button for at least 3 counted seconds.
Note: After pressing the reset, it is easy to count to 3 seconds too fast, count out loud to 3 like, 1001, 1002, 1003. You can’t hold it too long, VIMs will enter upgrade mode even if you keep holding the power button. I find whenever I do a deliberate count, VIMs enter upgrade mode reliably.
Hope it helps.