Flash files are used for do software or update mobile old software.You have a nokia x2-00 mobile? If its flash file has exposed to bugs outdated or corrupted. You will need to flash your phone using the latest flashing files package. You can download the latest flash files for your Nokia X2-00 (RM-618) from below provided link for free. Just download the firmware (v 0.8.25), flash your phone and bring it back to a stable condition if its firmware has exposed to errors.
Remember: Before flashing take backup of your important data which is on your phone. After flash you will lose your all of data and your mobile will be restored in its original settings. Now you can download flash files from below links.