JVM error 102 has appeared on my blackberry bold screen. How do i reset the phone so it can function

Hi, my name is jeff and I work for a used cell phone and repair store in Sioux Falls South Dakota called THE CELL PHONE GUY. the phone needs to be flashed and re-programed, to factory settings, ive had one of my clients come in with the same exact problem on his tour. i tried to trouble shoot it and could not figure it out. i gave it to our tech guy, and he said he didnt have the software with him to reset the phone, so i simply sent him down to a verizon store and hour later he came back with his phone working, the downside, you will lose all of your data. if you have anymore questions of get it fixed let me know, i love the feed back!!!