: Plug the RS232 cable into the PC and the receiver (keep the receiver powered off initially).
: Open the loader, select the correct COM port, and choose the firmware file.
: Specifically a "Female to Female" null-modem cable or a USB-to-RS232 adapter if your PC lacks a serial port.
These "loaders" are small Windows programs that facilitate a data connection between a PC and the receiver via an to flash firmware or recover "dead" devices that won't boot. Core Features of a 200HD Loader