experimental			The respective latest version to update the experimental routers to - may not be available
stable				The respective latest version that stable routers should update to - may not be available

With our rare updates of what Luebeck declared stable, the experimental
images should be used by default.  All images are compatible with Batman
15 and later. The ones tagged with "2017" are of the newer LEDE generation.
If the default 2.4GHz channel is not 6, then this is identified by 
K<channelnumber>.

experimental_20170411_2016.2.		OpenWRT
experimental_20170618_2016.2.6
experimental_20170618_2017.x		LEDE