5.50 GEN-D3 to 6.39 pro B8 Help Please!


I have a PSP Slim 2001 running CFW 5.50 GEN-D3 and want to upgrade to 6.39 Pro B8. I keep getting "Sorry. This program doesn't support your FW(0x05050010)." I'm not sure what this means. Someone help me out please? Thank you.
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