Cisco 877 SDM Express loss of connectivity

Hello,

I=B4m a newbie in programing cisco routers, in the manuals for configuring 2 Wlan. they indicate to use SDM Express, and then use the SDM, but when i finish to use the SDM express in the same default net (10.10.10.1) i loss connectivity and can=B4t ping the router in:

10.10.10.1 s=F3 i can=B4t install SDM and finish the config... I reset the router with the 5 seconds reset buton and the putty using erase startup-config and reload several times but alway the same result in the ping command: transmit failed, error code 1231... I switch the router (I have 2 to configure...) it=B4s something what i miss...

Can you please help me.

Thank a lot.

Ant=F3nio.

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Antonio
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