Hello Mohammed,
You can technically also use Runtime Utility Center to execute the HDD/CF utility. Therefore, you don’t need AS.
However, this has the downside that you need to know the IP address of the PLC and it has to be valid. In BOOT mode, this means requiring a DHCP server and knowing how to obtain the provided IP address from the network/server. It’s just easier to download and install AS. Outside of BOOT mode, your AR is 4.33 or higher (aka modern PLCs) and you can’t use the HDD/CF utility.
(Runtime Utility Center doesn’t have the same browse/set IP address capability of Automation Studio.)
If you already have a USB project installation package, then you just needed to place the C30 panels into BOOT mode, and then perform the installation again. It doesn’t sound like you actually needed to clear the partitions on the C30, just get it back into a mode it would accept the correct project.
Since the Configuration ID is different/blank in BOOT mode, an initial installation is always performed and it would wipe the incorrect package from the C30.
Best regards,
Austin