acctually I also had the same problem with my ZG5 30 minutes ago, than I follow kenneth advice to click at or paste this link to your url to download this file
there is the following instruction there
Create a recovery USB drive to update the Bios on the unit. The specific steps to perform this recovery with the USB drive are:
Download & Extract AS1_BIOS_3309.zip
Rename the Bios name from 3309.fd to zg5ia32.fd.
* after renaming this 3309.fd file I thought I should also edit batch command inside 3309.BAT
* so I did, it's not difficult just open 3309.BAT using notepad and edit *
* flashit 3309.fd /mc /all /dc ===> to ===> flashit zg5ia32.fd /mc /all /dc
* than I save this file under the same name (3309.BAT)
Copy zg5ia32.fd and Flashit.exe and (3309.BAT also) to USB flash drive.
Start the restoration process:
A. Plug the AC Adapter into the unit.
B. Insert the USB flash drive into a USB port.
C. Press and Hold down the Fn and the Esc keys together.
D. Keep these keys held down and press power.
E. When the unit's power light comes on release the Fn and Esc keys.
F. After the keys have been released the power light will start to blink.
G. Let the unit run and after approximately 1-7 minutes (by the fact in My case I Only need 10 second), the unit should reboot.
H. Video should now be restored.
tadaa.. my zg5 post like it used to be
thank you very much for the programmer, kenneth for this useful link and all of you,