You don not need to return back original internal memory before You do the update to any firmware (don't forget eject your sdcard before flashing if you will use LiveSuite). But after flash any firmware you will have original internal memory. You need run the script for switch memory again AFTER each flashing firmware.
I mean I already use of your memory card script and I not want to format my scard
should I need to return back original internal memory before I do the update to feiyu mod cons 4.0.3(0429)?
So. You can upgrade to feiyu mod cons 4.0.3(0429), boot completely, than You can run the script or not.