It appears you can get all the files from the repository backup:
Bootloader:
http://repository.hpcfactor.com/public/jlime/releases/donkey/bootlo...
Bootloader Configuration:
http://repository.hpcfactor.com/public/jlime/releases/donkey/bootlo...
Kernel:
http://repository.hpcfactor.com/public/jlime/releases/donkey/kernel...
Userland:
http://repository.hpcfactor.com/public/jlime/releases/donkey/userla...
The 620/660 JLime Vargtass 5.0 userland contains some extras, but the original one should otherwise work just fine.
I put up some instructions on Vargtass
(aimed at the 680/690, but should be transferrable to the 620/660
):
https://deuill.org/code/jlime-vargtass/
The original developer of the 620/660 port had some info here:
https://web.archive.org/web/20140620191716/http://fz.hobby-site.org/...
I don't really track these forums much anymore, so if you have any questions, I've got my email address on
the
https://deuill.org website
(obviously ain't gonna help anyone else like that, though
).