Hi,
since the kernel / firmware update I'm getting the following error and 5GHz wifi stopped working:
$this->bbcode_second_pass_code('', '
[ 8.899653] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 8.908816] brcmfmac mmc1:0001:1: Direct firmware load for brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.bin failed with error -2
[ 8.926067] usbcore: registered new interface driver brcmfmac
[ 9.112449] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 9.114480] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 9.120295] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Nov 1 2021 00:37:25 version 7.45.241 (1a2f2fa CY) FWID 01-703fd60
')
2.4 still works but it seems on very poor performance compared to before.
I've downgraded from linux-firmware 20220509.b19cbdc-1 to 20220411.705f19a-1 and it works again.