The relevant parts of this firmware readme:
Different firmware variants
Three network protocol application firmware variants are available:
- EmberZNet NCP = Zigbee NCP (Network Co-Processor) is used as a dedicated Zigbee Coordinator for Zigbee-only environments*
Pre-Compiled Firmware
Firmware builds can be found in the firmware_builds folder.
ncp-uart-hw- EmberZnet pure Zigbee
I see this web based flasher:
Should allow me to upgrade my FW easily with this current version: