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