Demonhades.org member tito1 has realesed a nice little package for your jailbroken PS3 consoles, MinVerChk. This can be usefull if you want to know how far you can downgrade your consoles. He is also going to keep his thread updated with the latest feedback from other users, on which systems are able to downgrade to which firmware. You can visit his post for more updates.
Instructions translated via google:
Source: DemonHades.Org [Lugar alternativo de Scene,Investigacion,Fomentacion de Proyectos,Didactica no lucrativa y Critica Argumentada] • Ver Tema - Investigacion MODELOS PS3,indica tu base de DowngradeoTutorial created by DeathHades.
This tutorial will teach you to how to know the base firmware of your PS3 with a few steps and images.
The first thing you have to do is:
- A PS3.
Here I leave the MinVerChk - link: DemonHades.Org [Lugar alternativo de Scene,Investigacion,Fomentacion de Proyectos,Didactica no lucrativa y Critica Argumentada] • Información
Well here I leave the steps.
1 - Enter the MinVerChk in the pen, as if it were an upgrade.
2 - Insert the stick into the PS3.
3 - Install the update from XMB (This will fail and display the Firmware Base).
Here I leave the photos.
Instuctions (SPANISH):Multiupload.com - upload your files to multiple file hosting sites!
Download MinVerChk.rar Attached Below