Getting a IDXFFFFFFFF error while trying to downgrade!

Cloud

Moderator
I just bought a new PSP slim - 3004 (09g) model with 6.39 firmware, and I was trying to downgrade it to 6.20 firmware using Chronoswitch Downgrader but everytime I am getting a message The update cannot be started, The data is corrupted (IDXFFFFFFFF). How to solve it?
 
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