You already read the title now here is the answer how:

Let me explain my problem I have ps3 2508A, Two days ago i downgrade it using flasher, everything is running so cool (Cfw is booby downgrade and zofmods AKA overflow)…

Today i have time…

Why Overflow PS3 CFW is Giving Headache?

Source: PS4 News – Why Overflow PS3 CFW is Giving Headache?