IPSec Preshared key after upgrade from 4.0

Hello,

I had to replace a very olf FGT 200A with a new FGT 200D.

FGT 200A has a 4.00 firmware with an IPSec VPN

I applied the same IPSec configurations on the new FGT200D.

The only thing im unable to export is the preshared key. a copy&paste from the old firewall of the ENC hashed password fails: the 200D keeps changing it after a save (from the CLI).

for exaple on the 200D, if i put "set psksecret ENC aaaaaaaaa", i save it with a "next" command.

If i make a show of the vpn config i keep having a "set psksecret ENC bbbbbbbbb".

new firewall changes it after a copy&paste from the old one