I have a router which I have changed the password. but I can not remember it. I have placed it as a slave to Fedora. I can see the file structure. but I couldn't find the password file. can someone help me to find the password file. I have many configuraitons on this pc and I don't want to format it.

Sorry Boss,
You have to format / Reinstall it. There is NO CHANCE to get the password.

ASHISH

If there is someone who can do such a service, I can pay for it. I don't want to loose my datas

There is not such service.
You have to reset configuration with reinstall.
Try to keep backup or 'export' file for the next time.