UNZIP all files to a new directory on your machine.
Follow the directions for your specific OS

Windows:
* Open the command line in windows and 

* Go to the directory where you unziped the files. 

* Connect the ZUM AMBE server board 
to your PC via a USB DATA cable.

* Open Device Manager to find COM port of your board

* Use the following line to flash the firmware
onto your board.
(Change the COM port in the following line.)

esptool.exe --chip esp32 --port COM10 --baud 921000 write_flash 0 zumambe-v1.1b.bin


Linux:
* Open a terminal

* Go to the directory where you unzipped the files.

* Type the follwing then press ENTER
pip install esptool

* Connect the ZUM AMBE server board 
to your PC via a USB DATA cable.

* Type the follwing then press ENTER
lsusb

* Make a note of the serial port of your board. Will
start with /dev/ttyUSB

* Use the following line to flash the firmware
onto your board.
(Change the text following --port in the following line. Use 
the serial port of your board.)

esptool.py --chip esp32 --port /dev/ttyUSB0 --baud 921000 write_flash 0 zumambe-v1.1b.bin


macOS:
* Open a terminal

* Go to the directory where you unzipped the files.

* Type the follwing then press ENTER
pip install esptool

* Connect the ZUM AMBE server board 
to your Mac via a USB DATA cable.

* Type the following then press ENTER
ls /dev/cu.*

* Make a note of the serial port of your board. Will
start with /dev/cu.usbserial

* Use the following line to flash the firmware
onto your board.
(Change the text following --port in the following line. Use 
the serial port of your board.)

esptool.py --chip esp32 --port /dev/cu.usbserial-DM02IG0Y --baud 921000 write_flash 0 zumambe-v1.1b.bin