have a look to page 2 of the installation manual :
" IMPORTANT : This upgrade automatically sets the loading of the INS and the USER LIVE GUITARS. Any auto-loads perviously set by the user will be disabled. The user can restore his own auto-loads following the in dications shown at the end of this document, in section "additional information". !
In the installation manual for the 4.2B Version on ketron homepage youŽll find :
"Notice : Update procedure doesnt modify your own files except StartUp file (Global, Midi Pedals and Video setting ) which will be overwritten to be suitable with the new implementations.
Hope that answers your questions