More than 6,000 years ago?
The predecessors to the Akkadian Empire certainly had fire. There may have even been an earlier "empire" before the "city" of which was likely more than 7,000 years ago as at least a fire burning village.
The Elamite civilisation is about 6,000 years ago.
The only reason we know anything much at all is survival of clay tablet writing preserved because the places got burnt.
If there was a civilisation 10,000 years ago or 20,000 years ago they inconveniently didn't write on clay and set fire to the city. Anything else other than cave paintings would be gone.
There is some suspicion that some cave "art" might include "writing". Which would push back literacy + fire to maybe 20,000 to 50,000 years. Maybe but dating can be controversial.