Is it possible to fix hard bricked device?
In a softbricked device, critical partitions like a recovery partition is usually preserved which helps to easily recover from the condition, but in a hardbricked device all the software interfaces that provide access to the hardware are unavailable, that means there is no method for you to communicate with the hardware. As Robert has rightly said, you need to physically access the hardware in order to flash a software, which in case of integrated hardware is very difficult. To circumvent a hardbrick situation, Snapdragons have an Emergency Download Mode (EDL).