IOS降级后Cisco AP命令消失

enter code here在降级Cisco 881w AP（WLAN-AP）之后，出现了一些奇怪的现象。

当我使用以下连接在WLAN-AP接口上时：

 service-module wlan-ap0 session 

我得到了这个提示：

 AP588d.09ba.156e> 

然后当我input“启用”时，它要求我input一个密码，这个密码已经被原因不明的原因重新设置，现在是“思科”。 然后我得到这个提示：

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 AP588d.09ba.156e# 

奇怪的是，所有的configuration已经重新设置（所以wifi不工作了），当我键入“？”，只有这些命令可用于我：

 Exec commands: cd Change current directory clear Reset functions clock Manage the system clock crypto Encryption related commands. debug Debugging functions (see also 'undebug') delete Delete a file dir List files on a filesystem disable Turn off privileged commands enable Turn on privileged commands exit Exit from the EXEC fsck Fsck a filesystem help Description of the interactive help system led LED functions lock Lock the terminal login Log in as a particular user logout Exit from the EXEC lwapp lwapp exec commands mkdir Create new directory monitor Monitoring different system events more Display the contents of a file name-connection Name an existing network connection no Disable debugging functions ping Send echo messages pwd Display current working directory release Release a resource reload Halt and perform a cold restart rename Rename a file renew Renew a resource rmdir Remove existing directory save Start to save raise_interrupt_level stack send Send a message to other tty lines set Set system parameter (not config) show Show running system information systat Display information about terminal lines terminal Set terminal line parameters test Test subsystems, memory, and interfaces traceroute Trace route to destination undebug Disable debugging functions (see also 'debug') upgrade Upgrade software verify Verify a file where List active connections 

所以我没有“复制”或“configuration”命令，没有“归档”命令推入一个新的IOS。

另外，我有15级的特权：

 AP588d.09ba.156e#show privilege Current privilege level is 15 

请帮我在AP上恢复工作的IOS。