Scrid2000 over at OSBB has posted a great tutorial on how to downgrade your playbook OS using a local copy. Anyone who has been following the whole DingleBerry/rooting scene that has come to up in the past few weeks will know that the last 2 patches by RIM has blocked the root. These steps let you trick Desktop Manager into using a local PlayBook operating system to downgrade.
Chris Wade, the creator of DingleBerry had given us instructions on how to downgrade using an Apache server, and some of the guys over at CrackBerry had also been working on a method. But this method is for everyday rooters, who don’t have access to an Apache server.
Here is the link to the wonderful tutorial How to downgrade your Playbook OS using a local copy. And please remember that this is an advanced process that requires some timely actions, and any fault on your behalf could ruin your device(s).