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So I have a ps4 that has version 600, but I would like it if I could revert it a couple versions back So I thought if maybe I could remove the CMOS battery to make the system forget any other previous firmware if you also delete the hard drive and try installing an older versionPlayStation 4 owners on Twitter have discovered the possibility that the console's CMOS battery may render the console unusable when it dies By Thomas McNulty Published A number of PlayStation 4 owners have seemingly proven, through various experiments, that the console can not play games once the internal CMOS battery diesMcDonald's statement was in response to a tweet from Does It Play, an account that's dedicated to video game preservationDoes It Play stated that when "the PS4 CMOS battery Ps4 Replacement Cmos Battery Holder Playstation 4 Ships From Us Ebay Ps4 cmos battery reddit