powered it up into update mode and tried the software update again.  it got through the write stage and has been on the update point for a few hours with the vertical bars sweeping from side to side on the display.  currently the side to side sweeps are going part way across the display, somewhat random looking.  is this going to make it? 

should this be interrupted for another try?  can an older firmware go on instead of the 5.0.0 beta?  the next one on the list is 3.5.0[4].