Thanks. I did notice the aliases. and the ota2 multiple device spec. Appreciate the assist.
Spoiler:
I was doing a
for TYPE in k2 k2i dx dxi dxg k3w k3g k3gb; do kindletool create ota -C -d `echo -n $TYPE` ./ ../update-install-kindlet-jailbreak-`echo -n $TYPE`.bin; done
and
for TYPE in k5w k5g k5gb pw pwg pwgb k4 k4b pwgc ; do kindletool create ota2 -C -d `echo -n $TYPE` ./ ../update-install-kindlet-jailbreak-`echo -n $TYPE`.bin; done
I see your way makes more sense with the serial number linkage. Thanks
Will have a go now.
EDIT: Okay so I think I have it now. I will just go check one of the 3 un-installers/installers - for sanities sake - before I share.