Installing LEDE firmware on Actiontec R1000H

I found this old hardware from a friend and this router has very little options. So i decided to get a wrt and see if i can expand its capabilities. Found out its from BellAliant provider and the capabilities like customizable wan mac address, firmware upgrade features are missing. I tried bringing the device to TFTP mode to flash by holding the reset and powering it on, but could not get it done. Is there any other method of flashing the firmware? I'm new to wrt and have done this only once on a netgear router. I found the firmware through this link:

Forgive me if this sounds very simple but i couldn't find a solution. Thanks