When I upgrade linux-firmware from 20201218.646f159-1 to 20210208.b79d239-1 and reboot, the wifi device is missing. It seems a firmware issue. I have tried to reinstall the package. The result is the same. Here is the demsg log I reload the kernel module brcmfmac.
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[ 1233.031297] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1233.039701] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1233.057760] brcmfmac: F1 signature read @0x18000000=0x15264345
[ 1233.061404] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
[ 1233.071479] usbcore: registered new interface driver brcmfmac
[ 1234.176268] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50
[ 1235.186507] brcmfmac: brcmf_sdio_htclk: HT Avail timeout (1000000): clkctl 0x50
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