$ dmesg | grep wifi
显示：Open firmware file failed /lib/firmware/rkwifi/fw_bcm43438a1.bin

https://github/BPI-SINOVOIP/BPI-files/blob/master/others/brcm/lib/firmware/ap6212/fw_bcm43438a1.bin

$ sudo reboot
$ dmesg | grep wifi
提示：Open nvram file /lib/firmware/rkwifi/nvram_ap6212a.txt

https://github/BPI-SINOVOIP/BPI-files/blob/master/others/brcm/lib/firmware/ap6212/nvram_ap6212a.txt

https://github/respeaker/rkbin/tree/master/firmware/wifi

换源

https://mirrors.tuna.tsinghua.edu/help/debian/

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu/debian/ buster main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu/debian/ buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu/debian/ buster-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu/debian/ buster-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu/debian-security buster/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu/debian-security buster/updates main contrib non-free

change locate

$ sudo tzselect
$ sudo cp /usr/share/zoneinfo/Asia/Shanghai  /etc/localtime
$ sudo ntpdate time.windows or ntpd time.windows