Anybody can help with firmware for Netscreen 5

Hi,

I got Netscreen 5 off eBay and it's running some antique firmware (version
1.65). Juniper EOLed it and hence do not provide any (even old firmware
updates). I'd like to upgrade the latest version, I can download ScreenOS5
off eMule but direct upgrading from 1.65 is not supported, I need to upgrade
to 3 then to 4 and then to 5. So I'm looking for any firmware better then
1.65 if you have one.
You can email me at forward.to.greg (obvious) gmail.com

Thanks,
L