Green Heron Engineering RT-21
firmware v4.13.2
Green Heron Engineering · Released Sep 9, 2026 · First seen Sep 9, 2026
Source:
greenheronengineering.com
v4.13.2 is the latest firmware for the Green Heron Engineering RT-21, released September 9, 2026.
In short — summary by updatemystuff.com
Adds LAN and direct TCP modes for Ethernet or WiFi.
- LAN and direct TCP modes for Ethernet or WiFi
- K7NV firmware included
- K0XG firmware included
Written from Green Heron Engineering's release notes, which are printed in full below.
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What's in this update
The current RT-21 version 4 firmware. V4.13 adds LAN and direct TCP modes for Ethernet OR WiFi NOTE: Version 4 FW is only for controllers above s/n 4000 (v4 controller CPU) .zip includes latest firmware for K7NV (Prop Pitch) and K0XG units as well.
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