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Troubleshooting • Re: lots of brcmfmac errors such as "brcmfmac: brcmf_sdio_isr: failed backplane access"

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I have set it all up on another PiZ2W with another PSU, cable, SD card.
Same issues.

I've now found that there are a number of similar issues reported on the Raspberry Pi Git Hub but no concrete answer.

Seem to be an issue with Broadcom drivers somewhere some how.

I think I'll try a dongle and turn off the internal WIFI and BT.

Cheers
Andy

Statistics: Posted by AndyNC — Sat Dec 20, 2025 4:08 pm



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