Get PS3 out of Demonstration mode

I got 2 PS3's here in Demo Mode on firmware 4.46. I learned, that there is a reverter file to get them out of this mode, but the files for 4.46 are never provided on psxhax.com psxhax.com/threads/ps3-demo-kiosk-shop-firmware-reverters-and-tutorial.374/

Anybody got another method or even can upload these files?

I found reverter files for 4.80 - 4.84, can I use them or will I brick my Kiosk...

Get PS3 out of Demonstration mode