1 更新系统

apt-get update

apt-get upgrade

2 安装rpi-update并更新

apt-get install rpi-update

rpi-update

3 更新固件

wget https://archive.raspberrypi.org/debian/pool/main/f/firmware-nonfree/firmware-brcm80211_20161130-3+rpt4_all.deb

dpkg -i firmware-brcm80211_20161130-3+rpt4_all.deb

4 连接wifi

nmtui connect