Download ThinkRF R5500/R5550 firmware v1.6.6 in the attachment.
Refer to the instruction here for how to do a firmware update.
This document describes version 1.6.6 of the firmware for the ThinkRF R55x0 family of real-time
spectrum analyzers. It is distributed as a single binary file, ThinkRF_R55x0_firmware_v1-6-6.img.
This version of the R55x0 firmware is compatible with all ThinkRF R55x0 products, including R5500
(all models) and R5550 (all models).
1. Added support for new R5550-*-WBIQ products.
Known Issues and Limitations
No known issues or limitations.