Here we go...
PS3Key Downgrading JIG files are now online.
Enjoy!Originally Posted by ps3key
As usual since v3.55 is out now, you can only use this release to Downgrade v3.50 or LOWER firmwares!
News Source: PS3Key Downgrader firmware online!
For the PS3KEY firmware you must visit their site: Log in - PS3Key
Register with your email address, agree to their terms, and input your serial number of your real PS3KEY dongle, and then you get to select the right files ATMEL or SILABS for the downgrading feature.