Using erase_region with esptool.py

[PurpleAir]

Hello

I have been playing around with esptool.py as an alternative to this in Arduino.

I have a question about the -cz command in this tool as opposed to the erase_region command in esptool.py.

How can we translate the -ca and -cz addresses to be used in the esptool.py erase_region command?

For instance:
Arduino uses esptool -vv -cd nodemcu -cb 921600 -cp /dev/cu.wchusbserial1430 -ca 0xFC000 -cz 0x4000 -ca 0x00000 -cf /thebinfile.bin to flash with the option to "Erase sketch + WiFi settings"

However, using esptool.py --baud 921600 --port /dev/cu.wchusbserial1430 erase_region 0xFC000 0x4000 does not erase the WiFi settings.

What am I missing?

Thank you!
Adrian