Originally Posted by DEFAULTDNB
3.60 cfw seems plausible now, or possibly an updated mod of 3.55.
For 3.56+ users tools can be signed for your firmware so you may be able to software downgrade, or even run back ups.
Where did you get this? We don't have the private keys. So, how exactly are we going to sign anything? The fail0verflow bug for calculating private keys was fixed after 3.55.