Moved to Navigation Forum----Hi this is my first post (Junior!...I'm 43). I am trying to burn a CD for a Software update to a Nav Plus RNS-4.1. I have read a few posts which seem to say just burn the files (tried Update_RNS_D_151101.zip and Update RNS_DX_10092003.zip) to a CD (iso data) but my Nav unit will not read the CD. Does it matter which software is currently installed? Does the CD need to be formatted bootable? I have burned as slow as possible 4x in K3B (Ubuntu). I have tried inserting the CD before and after I start the Nav with the "3 button press". Lost for ideas all I can think is that my CDs are coasters maybe 1x is required. I am currently using Memorex CD-R (ASDA(UK)/Walmart(US)).