I'm having the same problem. I unlocked like a year or so ago and flashed to the newer verizon 6.5 leaked ROM. Today, I tried to flash to a different rom and got the 262 error. I tried six or so different ROMs including a stock ROM and also followed the tutorial here
http://forum.ppcgeeks.com/showthread.php?p=648575 I have tried a task29 and a radio flash all resulting in the same error. If i figure something out, I'll repost, but so far nothing is working.