I founds these steps help me to get my usb to be seen by my laptop after flashing a new rom. So after I fat fingered and factory reset instead wiping cashes. So I had to use a recovery method for my g3 to work correctly. tot or kdz. Then went thru and re-rooted and changed back to mtp mode loaded new rom to phone went to recovery and dirty flashed. Dirty flashing seemed the only way for my to get the usb to be recognized.