@geekmaster, if you mean use Kubrick to activate diags mode via USB Downloader connection, that won't work post-KT.
The Rescue Pack and Cowards Rescue Pack is much more reliable.
@susmoka, tell us which steps you are having trouble with.
Most of this is done on the Kindle itself, the main PC/Mac difference will be that Mac should have ssh built in so no need to download PuTTY.