I check my dump.hex file several times with "PS3DumpChecker" and "PyPS3checker" both says the same "WARNING: NOR dump must be patched with 4.XX Patchset to install CFW on this machine"; i imagine that means that i still don't write the flash memory.
Another thing about the dump file is that in "PyPS3checker" at the end of the check says "Checks of late CHECH-25xxx, CHECH-3xxx and CHECH-4xxx consoles dumps still under development! It could return both false positive and false negatives results." My ps3 is CECH-2504A datacode 1A minver 3.56 so i think that my console is not under warning but i am not sure.
Another thing about the dump file is that in "PyPS3checker" at the end of the check says "Checks of late CHECH-25xxx, CHECH-3xxx and CHECH-4xxx consoles dumps still under development! It could return both false positive and false negatives results." My ps3 is CECH-2504A datacode 1A minver 3.56 so i think that my console is not under warning but i am not sure.