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First and foremost, did you start with the Holy Grail of steps when dealing with routers?
30-30-30

YES! It does make a difference and it matters.
Hopefully you haven't bricked it (probably not).

If it is powered on, press and HOLD the reset button until the VERY END, DO NOT LET UP.
Holding the reset button for 30 seconds, then unplug the power and wait 30 seconds, plug power back in and wait 30 seconds. . . NOW you can let up on the reset button.

Now you can try and reflash the firmware, DO make sure you are using the correct version of DD-WRT for your EXACT model AND Version.

I have only done a few, but the 30/30/30 is crucial I am telling you!

INSTALL VERSION 10.0.....,THERE ARE PROBLEMS WITH YAHOO MESS 11.

try after some time or hours.
yahoo server is down

sometimes YM is very busy for connecting people..that is why you are unable to connect but try reconnecting again...it works

be sure your password and username is correct and your internet connection is stable...

You see to capslock and numlock, and language, if there are right and your message will be, reset router., then log in by standart login password.

If you reset the router perhaps you reset the password as well. there are default password lists on the internet for your make and model router. However for your username and password i would try admin for both fields, or just user and leave password blank. If that doesnt work sometimes tech is the default password. Again it depends on the model. this is a site for default passwords. your router may be here http://www.searchlores.org/defpasslist1.htm
Hope this helps you Sean

https://support.microsoft.com/en-us/help/972034/how-can-i-reset-the-hosts-file-back-to-the-default

Checking virtual IP servers...
[VIP Raw] Connecting to Virtual IP server 98.136.48.32... [PASSED]
[VIP Raw] Sending HTTP request to the server... [PASSED]
[VIP Raw] Receiving response... [PASSED]
[VIP Raw] Checking HTTP response code... [PASSED]
[VIP Raw] Parsing connection server IP address... [PASSED]
[VIP Raw] Connecting to Virtual IP server 67.195.186.241... [PASSED]
[VIP Raw] Sending HTTP request to the server... [PASSED]
[VIP Raw] Receiving response... [PASSED]
[VIP Raw] Checking HTTP response code... [PASSED]
[VIP Raw] Parsing connection server IP address... [PASSED]
[VIP Raw] PASSED *** 98.136.48.85 ***

Checking connection servers...
[CS Raw] Connecting to connection server port '5050'... [PASSED]
[CS Raw] Sending port check command... [PASSED]
[CS Raw] PASSED

Checking login servers...
[Login] FAILED
*** 'COMPONENT_TYPE_YCP' YCPError: 'FND.0001' ***

elisei_eli2008