WE SUPPUOSE THAT A PS3 WITH OFW MINIMUM 3.60 NO METLDR2 WORKS BUT THIS WAS NOT TESTED
I can confirm this. Did it yesterday on my CECH2504A datecode 1B which only accepts 3.60+. I tried to downgrade it with earlier firmware, but it would just make 3 beeps and shutdown. I installed rebug by patching both ros in flash and after it booted I installed the whole .pup. Works fine.