Read/Write CERT
In Samsung models, the serial number otherwise known as IMEI was protected by reading and writing digitally signed certificates. This was to prevent the opportunists from manipulating the original serial numbers without authorization. Often time this part is prone to damages or overwriting by outside tools and in the that occurs, having a back up of the piece would be very beneficial. Because it can restore what was lost without a hassle.
Repair(Root) and Unlock (Root)
Read/Write SEC
Contains fuse settings such as mainly bootloaders and OEM settings