Okay, well according to the manual of the router, you should be able to follow the instructions found here, on page 45 (51 of 70 in PDF terms) on how to recover from a failed firmware upgrade.
http://www-id.linksys.com/servlet/Satellite?blobcol=urldata&blobheadername1=Content-Type&blobheadername2=Content-Disposition&blobheadervalue1=application%2Fpdf&blobheadervalue2=inline%3B+filename%3Dbefsr41V3_ug.pdf&blobkey=id&blobtable=MungoBlobs&blobwhere=1130840373764&ssbinary=true&lid=9972327262B04
Follow those instructions and you should be good to go.







