adjusted default behaviour

git-svn-id: svn://svn.dd-wrt.com/DD-WRT@25057 52c4871e-980c-0410-b1e0-e73912ce01f8
in cfe revision 2.0.8 netgear introduced a new size limitation for the image

git-svn-id: svn://svn.dd-wrt.com/DD-WRT@25058 52c4871e-980c-0410-b1e0-e73912ce01f8