A lot of exploit hosts also have an update blocker option.
I'm not near my ps4 at the moment, but if you check the threads that list exploit hosts you're sure to find one that will have the update blocker.
This prevents the ps4 from downloading...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi