Did you mean NFI dump, or are you looking to dump the contents of the flash into a file? The later has a function built into the web flashing screen IIRC, put the box in stop mode & point your browser at it...
but why you look for it..just get a working box dump the flash and+eeproom and you ready to go...if you have the tsop...(of course make sure working box and faulty box has the same sim version)
also why you need dump???cos you like to repair the faulty box???cos same case no help re prog..the flash..this clones they gets easyly f@c@k up cpu in this case is hope less all your work...
so better take the working flash solder the faulty box and try if really the flash issue......