Cerbo GX firmware update disables the bluetoogh

[DominicNicholas]

Hi,
I have recently updated two Cerbo GXs to official release version 3.62 or beta release 3.70~6 respectively and both units upon rebooting the bluetooth is no longer functional. Has anybody experienced this and is there a fix? If a bluetooth dongle is connected, the bluetooth on both Cerbo’s function. Is there a fix where the use of the dongle is not needed?

I have reverted to the previous firmware on one unit and the bluetooth came back on and functioning normally without the use of the dongle.

[nickdb (Nick)]

If you refer to the manual, you will find a range of serial numbers where this is known behaviour caused by load and or temp, requiring an external dongle to be used.
Chances are, yours are in the range, and the load from the update, and the increased cpu usage of the newer version, is triggering this documented issue.

[pwfarnell]

See one of many reports linked below

Cerbo GX Firmware 3.60 Ruuvi Sensors

Do you have an older Cerbo from before early 2022, serial number up to HQ2207. If you have an older Cerbo the internal board/ processor gets too hot and Bluetooth shuts down. As the firmware size and complexity increases the cpu load increases and the internal temperature rises. If you have the older device then it is inevitable that at some point this problem will occur as firmware develops and the use of an external USB Bluetooth dongle is proven. From the manual. Note for Cerbo GX units bu…

[DominicNicholas]

Hi, yes they are in the series. the note in the manual just states about the temperature. What threw me off was as soon as the new updates were put on it stopped working, and the reverse when the old firmware was restored.

[nickdb (Nick)]

The higher the load the higher the temp..
Updates increase the variables, but bottom line, the docs are clear about not using the internal Bluetooth.