I've had one or two isos that worked fine until i removed the update folder then for some reason they wouldnt work so I just opened notebook and made a 0k file and named them boot.bin etc. and put them in an update folder in the same location and then they worked fine again and the update icon didnt come up either. I don't know if any else has this issue, but hopefully it helps some1 out there.
actually with devhook 0.4x, the update icon won't excute update operation
my way to remove this: create 3 files< "PARAM.SFO" "EBOOT.BIN" "DATA.BIN" > filled with zero(HEX editor).replace orginal update files with these zero filled ones by a tool named "VCDROM Extension". BUT make sure you mark the checkbox "Keep Original File Size".then save and exit. this should be ok.compressed with Ciso can release these zero filled spaces.