[lubik]

Do I understand it correctly that the script activator (with run.sh) should start automatically when the SD card is inserted and FSC activator is used in Engeneering Menu?

Yes, but use fsc key posted in basic thread, it is legal and working, thanks to DP2XXXX

Do you mean the one from the first post?
# Activator for HNav_EU_K0257_6_D1 (ONLY FOR 3G High NOT for 3G Basic)
# Thanks to playaz187

Or should I copy the .fsc file from that activator to the script activator
# Activator Script (modified by DarkDLL) for 3G High