For pre boot mode on 2x5w you must hold ON button to the left.

Download and unrar this:

[Only registered and activated users can see links. ]

Open folder for repair and run updater.exe

add dot beside usb and put mouse currsor on OK button

Connect nuvi to PC and hold ON button to the left all the time.

When updater.exe recognize your nuvi click OK

When you see on your nuvi screen Loader or Loader loading you can release button

when process is done you will have mass storage connection

Now create backup of your nuvi if you dont have it

Format your nuvi to FAT

after format add all from your backup to the nuvi (dont add back gmapbmap.img and gmapprom.img for now)

Flash in pre boot with folder original

Now your nuvi work and you can add back gmapbmap.img and other .img