PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 4655
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

New WiFi clm_blob file for BCM43456 (Pi 400)

Thu Nov 19, 2020 9:02 am

Synaptics have provided a new clm_blob file that, in the same way as the new 43455 blob does, improves the connectivity in some regions and makes 80MHz channels available.

A pre-release version of the file is available from here:

https://drive.google.com/file/d/1J8Ddbs ... sp=sharing

Once downloaded, copy it into /lib/firmware/brcm/ - you'll need to use "sudo cp ..." because of the permissions on that directory and file. You may also want to make a backup copy of the original:

Code: Select all

$ sudo mv /lib/firmware/brcm/brcmfmac43456-sdio.clm_blob{,.bak}
$ sudo cp brcmfmac43456-sdio.clm_blob /lib/firmware/brcm/
Reverting to the original is simply a case of:

Code: Select all

$ sudo mv /lib/firmware/brcm/brcmfmac43456-sdio.clm_blob{.bak,}
We'd welcome some feedback from those brave enough to give it a go. I wouldn't recommend doing so unless you have hands-on access (or at least an Ethernet ssh connection), but it's hard to imagine anyone's data being at risk.

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 4655
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: New WiFi clm_blob file for BCM43456 (Pi 400)

Thu Nov 19, 2020 10:33 am

There's also a new firmware available: https://drive.google.com/file/d/1tLev-L ... sp=sharing

Install it in the same way as the clm_blob:

Code: Select all

$ sudo mv /lib/firmware/brcm/brcmfmac43456-sdio.bin{,.bak}
$ sudo cp brcmfmac43456-sdio.bin /lib/firmware/brcm/
Uninstall with:

Code: Select all

$ sudo mv /lib/firmware/brcm/brcmfmac43456-sdio.bin{.bak,}

PhilE
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 4655
Joined: Mon Sep 29, 2014 1:07 pm
Location: Cambridge

Re: New WiFi clm_blob file for BCM43456 (Pi 400)

Fri Nov 20, 2020 3:19 pm

On the assumption that the complete lack of feedback is down to the fact that replies are disabled, there's a thread for comments here: viewtopic.php?f=36&t=291825

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