I have a jtag and on it i have dashboard 16537 i want to update it to 16756 using xbox.com/updatecan i get my missing avatars back.
You don't want to use the update from xbox.com until after you've flashed your NAND with the 16756 kernel. After you've re-flashed the NAND, you can use the xbox.com update to get back avatars and kinect functionality. See here for a more in-depth explanation