Hackrf pro Bias T not working

[Robinson1999]

What outcome were you hoping for?

Enabling Bias T and having 5V on the output

What outcome actually happened?

No voltage detected on the output

What operating systems are you seeing the problem on?

W11

What is the output of hackrf_info?

(base) C:\Users\robin>hackrf_info
hackrf_info version: 2026.01.3
libhackrf version: 2026.01.3 (0.9.2)
Found HackRF
Index: 0
Serial number: 0000000000000000977c64de2d0b7013
Board ID Number: 5 (HackRF Pro)
Firmware Version: 2026.01.3 (API:1.10)
Part ID Number: 0xa0000a30 0x004f474d
Hardware Revision: r1.2
Hardware appears to have been manufactured by Great Scott Gadgets.
Hardware supported by installed firmware:
HackRF Pro
There are 6 other devices on the same USB bus.
You may have problems at high sample rates.

(base) C:\Users\robin>

(base) C:\Users\robin>hackrf_biast -b 1 && echo "OK" || echo "FAILED"
"OK"

Are you using any third-party software?

SDR++, SDRangeld, Hackrf spectrum analyzer, radioconda

Are you using any third-party hardware?

RTD-SDR wideband LNA, and measured open circuit with multimeter

[mossmann]

This is a firmware bug that has been fixed in git but not yet in a release. Note that the output voltage is 3.0 to 3.3 V, not 5 V.