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Backporting games that were dumped on 6.72 to run on 5.05.

Links:

Backporting Guide by notzecoxao: https://www.psxhax.com/threads/ps4-backporting-instructions-to-play-6-72-games-on-5-05-firmware.7565/

.prx bytes to search for: 18 00 00 00 00 00 00 00 BF F4 13 3C 01 00 00 00

Replace 4 bytes after with: 01 00 05 05

Downgrade script commands:
downgrade_elf.py –sdk-version 05.050.001 –verbose old.elf new.elf

downgrade_sfo.py –sdk-version 05.050.001 –system-version 05.050.000 –verbose old.sfo new.sfo
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Download Links:

UnfSelf: https://www.psxhax.com/threads/unfself-convert-ps4-fself-files-back-to-elf-files-by-dimosgsxr.5891/

Fake PKG Tools: https://www.psxhax.com/threads/free-ps2-pub-gen-fake-pkg-tools-ps2-fake-pkg-generator-for-ps4.3594/

GenGp4: https://www.psxhax.com/threads/gengp4-replaces-pkg-kitchen-by-xvortex-ps4-ftp-via-webpage.3807/

Downgrade Scripts from Flat_z: https://mega.nz/file/6ZFRSSIS#ziEfDOvdSQGBZSYUIjHmYeCpnQCTkjIkmxaorubOkvE

HxD (Hex Editor): https://mh-nexus.de/downloads/HxDSetup.zip
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LBRY: https://lbry.tv/@MODDEDWARFARE
BitChute: https://www.bitchute.com/channel/cZkNdmW4NL5Q/

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