As per my knowledge, your approach is right. Please let me know about the result.
Btw, will you please elaborate the problem you were actually facing in dd-wrt?
For anyone having this issue still, I found the original firmware in .trx thanks to lexpato (https://www.youtube.com/user/lexpato).
Go to http://tomato.groov.pl/download/K26ARM/ and click "Netgear R-series Back to OFW" and there you go!
New & Existing Users: Welcome to the new MyOpenRouter
Meet the MyOpenRouter Experts
Active Forum Topics
New & Updated Forum Topics
Unanswered Forum Topics
MyOpenRouter.com is not affiliated with NETGEAR®. NETGEAR is a registered trademark of NETGEAR, Inc. in the United States and/or other countries. Other brand names mentioned herein are for identification purposes only and may be trademarks of their respective holder(s). © 2015 NETGEAR, Inc. All rights reserved.