Works on OFW 4.80 to 4.82 and HFW 4.83 to 4.90.
Offical Flash
https://ps3addict.github.io/enablehen/flash.html
Offical USB Port (Slot closest to BDVD drive)
https://ps3addict.github.io/enablehen/usb000.html
Alt. 1 USB Port (Left Hand)
https://ps3addict.github.io/enablehen/usb001.html
Alt. 2 USB Port (Left Hand)
https://ps3addict.github.io/enablehen/usb006.html
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Others htmls are UNTESTED and should NOT be used!