This depends on the firmware which you've at the moment. If you've one of my firmwares before -pre6, then you should uprade for sure. The changes are internal to keep your router working when nvram fails.
Thanks for your answer! Currently I'm runing official fw (1.9.6.9),... I tried also your pre6 fw and I played to much with some settings and finally I run "factory default" wich cause my router died.... pin 9 bring it alive...
Will try pre7...