cannot run 6.60 downgrader


i have a 6.60 ofw installed, i will downgrade it to 6.20 by using the downgrader available. I run the downgrader, and pressed X to start the process, the screen showed "OK, good for launch" ... but the psp will turn black and hang, then shut off. :( I cannot run the downgrader. Please help, thanks. :'(
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