| Any signed data could be flashed through Odin FULL FLASH , COMBINATION FILE
But custom binary its UNSIGNED code
FRP BLOCK any UNSIGNED code flashing , caused by OEM LOCK ( bootloader lock )
When OEM its unprotected , then you can flash unsigned data , but this feature is intended for developers to run unsigned code such as , twrp , cwm , etc ( custom recovery’s ) , for flashing custom roms , modify fs , rom cooking ....
Then , if you have OEM unlock , you can get access to hole bussines , but if you have OEM lock , then you can only play with signed data , backdoors, forensic hw |