PS3 Fat CECHC04 - can I downgrade from 4.87?

I sadly do not, this is my first PS3 (EDIT: first PS ever*) ever and I bought it from a country fair.. it didn't have any controllers and not even a power cable, but it cost like 25$ a couple of years back and it actually WORKED ; my current controller is a clone my brother used to play FIFA with friends on PC :).
 
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