I am not familiar with that site nor the L6/V280, to be honest, except that it is a P2K phone introduced 8 years ago. That's really ancient for cell phones, so gathering resources is difficult. I have not used P2K Commander because more recent applications were better suited for my use, but it should be adequate for your phone. Except that I have read reports that more recent Motorola drivers cause problems with connecting via usb; you may want to search for an older driver set than what you have.
The first thing you should do is make a full backup of your phone's software. But that is still no guarantee that you can recover your phone from a disaster. Flash&Backup (www.Motorola-Tools.com) can be used to back up and restore in several file formats; .shx can be flashed with Motorola's own RSD Lite (google it), which may be more reliable. But there is still no guarantee. Use your own judgment.