The pastebin now has a mirror for the 3.4+jb+keys main rootfs. Now it is a single file instead of a multi-part zip file, and not subject to the 10 downloads per week limit imposed by mediafire.
Also, I figured out how to edit the snipurl (by logging in instead of anonymous posting). The http://snipurl.com/debrick
link points to an identical mirror copy of the pastebin. Mirrors are good.
So, when debricking a K3, you can flash directly to the latest firmware with jailbreak and developer keys pre-installed.
EDIT: I also removed the old obsolete pastebin mirrors, to minimize confusion.