E 3 LINKER

Can I use E linker to downgrade on all ps3s?

After when I install E LINKER how do I start downgrading? I would rather have E3 LINKER installed than a clip please help me out im confused..

How would i downgrade the ps3 after E LINKER is installed i wanna buy e flasher package
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I wanna get into modding ps3 done too many jtag rgh xbox 360s help me out plz