Something I noticed, while glancing through the files:
There seems to be an image for the EB600EM, but not the EB600E. So that may be the reason why for some it bricks the device.
This installation does not have the usual(?) TGZ files containing a whole system - does it copy itself onto the device?
If so, there is no backdoor anymore, it seems - it has been removed from the rcS file.
Could be reinserted, I suppose.