1.在cisco官网技术支持模块下载对应的ap型号如3702（注：官网无法下载可以把对应的文件名字百度下，再用第三方下载）
2.修改文件名字以官网文件名字为准将解压文件后缀的.tar（jar）去掉 ap3g2-k9w7-tar.default
3.用console接口连接ap在pc端搭建tftp服务器，这里用win10举例：电脑直连网线，修改本机ip为10.0.0.2启动3CDeamon软件选择对应文件路径，选择本机ip
4.给ap断电，按住mode按钮不放（注：至少按住20s以上）
5.供电后看到终端提示
button is pressed, wait for button to be released…
松开made按钮
Button pressed for 29 seconds
process_config_recovery: set IP address and config to default 10.0.0.1
process_config_recovery: image recovery
image_recovery: Download defaultIOStar image tftp://255.255.255.255/c1240-k9w7-tar.default
examining image…
出现如上提示ap开始更新
New software image installed in flash:/c1240-k9w7-mx.124-10b.JA3
Configuring system to use new image…done.
Requested system reload in progress…download took about 408 seconds
Loading “flash:/c1240-k9w7-mx.124-10b.JA3/c1240-k9w7-mx.124-10b.JA3″…##################
File “flash:/c1240-k9w7-mx.124-10b.JA3/c1240-k9w7-mx.124-10b.JA3” uncompressed and installed, entry point: 0x3000
executing…
到此更新完成，ap完全启动后恭喜你的瘦ap已经成功升级成胖ap了。