Just picked up a used JV3 160S.  I've been reading about how it is possible to go "chipless" on these machines. I have figured out that I need to downgrade to firmware 3.1... which I did. The printer still seems to demand a chip on the cartridges, however. Is there a parameter I need to change to  go "chipless"? 
Thanks!
	
		
			
		
		
	
			
			Thanks!