If your FC630 have an iDRAC Enterprise you can upgrade through it by let iDRAC fetch directly all needed FWs from "downloads.dell.com".

Otherwise you can fetch single packages from https://www.dell.com/support/home/de-de/product-support/product/poweredge-fc630/drivers

Regards,
Joerg

You can refer below link for different methods to update a PowerEdge server

https://www.dell.com/support/kbdoc/en-in/000128194/updating-firmware-and-drivers-on-dell-emc-poweredge-servers