forgot security password in c510

i got c510 from my friend last week.......he forgot the security password.its CID52 only.pls help to reset the password..........................

If you mean "user code", you can reset it by unlocking your phone with Aerix.

but many aerix users are complaining that the battery life goes down once unlocked............is this true and is there any other way to reset "user code"

It never happened to me and i don't think so. The other way is to use SEUS, but you have to be careful: if there's a CID53 for your firmware (zone/language), SEUS will upgrade to it. That means you can no longer unlock it for free.

thanks.......i'll give a try