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OpenSprinkler 3.0 Firmware Update via USB
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For Windows:

1. Download nodemcu-flasher: depending on your
Windows version, download the Win32/Release or 
Win64/Release:
https://github.com/nodemcu/nodemcu-flasher

2. Download OpenSprinkler firmware (in .bin format):
https://github.com/OpenSprinkler/OpenSprinkler-Compiled-Firmware/tree/master/v3.0

3. Enter OS3.0 Bootloading Mode:

- Get a microUSB cable. Insert one end to your
computer's USB port.

- Press and hold the second pushbutton (B2), then
insert the other end of the USB cable to
OpenSprinkler's USB port.

- Release the button.

- The LCD display should remain dark, which indicates
it's in bootloading mode. If the LCD display lights
up, remove USB cable and repeat the steps above.

4. Windows should automatically install driver
unless if you use Windows XP or Windows 7 64-bit.
If driver is needed (i.e. system reports device
unrecognized), install the following driver:
http://raysfiles.com/drivers/ch341ser.exe

Assuming there is no driver issue, the device
will show up as a COMxx port where xx is a number.

5. Run nodemcu-flasher (from step 1), and use the
following configurations:

- On the Operations tab, the COM port should be
automatically selected (if not, select it manually).

- On the Config tab, click the 'gears' icon on the
first line, and select the firmware .bin file

- On the Advanced tab, Baudrate is 230400 (default), 
Flash size is 4MB (default), choose Flash speed (80 MHz),
SPI mode should be DIO (default).

- Go back to Operations tab, click Flash, and wait 
for it to complete.

6. After flashing, if the LCD screen remains dark,
unplug and plug back microUSB cable, it should
trigger a factory reset. Wait for the reset to complete.