XsavioR from the Exophase forums has released a 2.71 downgrader for TA-082 and TA-086 PSPs. This downgrader is “Corruption free” because it does not corrupt any keys other than the ones necessary to run firmware 1.50. HEN-D is also included which is needed to run the downgrade.

There is always a risk of bricking your PSP when downgrading! Use at your own risk! Only use this on TA-082 and TA-086 PSPs that haven’t been downgraded yet!

Make sure you have your PSP charger in at all times and at least 75% battery. Do not use fake memory sticks.

Don’t perform the downgrade until you have read the readme. Improperly downgrading can result in a brick! Check here to identify if your PSP has a TA-082/TA-086 motherboard or not.

Download from Exophase Forums