So far seven of our PYBD SF6W devices have started to have problems with the wifi module. When setting the wifi module to be active(True) an error message is printed to the console and the wifi is unable to be used. I have 7 devices that now show this behaviour, that in the past have worked fine connecting to a wifi access point and downloading files over http.

I have run the same set of commands using rshell/repl on a number of versions of the firmware, including the latest unstable release. I found it produced extra output statements on the v1.12 firmware that might be more of a clue.

This issue is related to the forum post.

As well as the "[CYW43] HT not ready", messages I have also occasionally seen "[CYW43] F2 not ready".

Entering REPL. Use Control-X to exit.
>
MicroPython v1.12 on 2019-12-20; PYBD-SF6W with STM32F767IIK
Type "help()" for more information.
>>>
>>> import network
>>> sta_if = network.WLAN(network.STA_IF)
>>> sta_if.config(trace=1)
>>> sta_if.active()
False
>>> sta_if.active(True)
[CYW43] HT not ready
[CYW43] HT not ready
[CYW43] HT not ready
[CYW43] send_ethernet failed: -5
[CYW43] HT not ready
[CYW43] send_ethernet failed: -5
>>>

Entering REPL. Use Control-X to exit.
>
MicroPython v1.16-259-g86371781e on 2021-08-31; PYBD-SF6W with STM32F767IIK
Type "help()" for more information.
>>>
>>> import network
>>> sta_if = network.WLAN(network.STA_IF)
>>> sta_if.config(trace=1)
>>> sta_if.active()
False
>>> sta_if.active(True)
[CYW43] HT not ready
>>>

Is it possible that the firmware on the SoC WiFi chip has been corrupted? Is there a way to reflash this chip?