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You need lv1 hash checks patched to get the firmware running on a downgraded console, it has absolutely nothing to do with QA flag.
You can always try to add that patch with PS3MFW, but don't be surprised if the console doesn't work properly with the dongle on (or if it bricks).
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PS3 Slim CECH-3004A 160GB (500GB)
PS2 Slim SCPH-70004 - FMCB 1.8b
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