After a few weeks I got back to projects for BlackBerry Playbook and I realized my debug token on device is no longer valid. It took me some tome to investigate what steps are necessary to update just the debug token (signing keys are still valid). It resulted in 2 commands. If you like working with command line rather than with Flash Builder with these kind of things, you may find following .bat script useful. The script creates and deploys a new debug token on device.