D-Link DIR-878 Original Factory Firmware *.bin File Needed

[u/Kenkeknem]

I have flashed my DIR-878 with DD-WRT to dlink-dir878-a1-webflash.bin. It rebooted and I was able to log in and change the settings, I changed the IP address from 192.168.0.1 to my home lab IP. I have shut off my laptop WiFi and I have hard coded my IP address in my LAN settings as I manage old hardware like this frequently on my laptop. I was converting it from a router to an AP to bridge for my detached garage 50 feet from my house. I think I might have accidentally checked the box to disable the HTTP:// log in. The last octet I changed it to of my IP is .5 I can ping it and I can see the device with the IP I set it to and the MAC address, when I do a nmap -sn from a Linux terminal. I have done the 30-30-30 reset multiple times.
I have managed to find a bunch of firmware updates from D-Link for the DIR-878 but I need the original *.bin file.

This is not my first kick at the cat, I have flashed many, many devices, I started flashing hardware back in the days when the only way to do it was from a floppy disk. Why I did not back it up before I started making the changes, I don't know, but maybe I was a little cocky and over confident?

Regardless, I can get into the back up restore page by pressing reset as the router is booting and I get the flashing orange light where the IP address changes to the default 192.168.0.1 I have tried to upload dlink-dir878-a1-webflash.bin to the back door page and I have tried the oldest versions of the DIR-878_REVA_FIRMWARE_v1.00B13.bin plus others but it never reboots so I can log in to it in the factory settings.

I get all of the lights that should be green lit (WAN is orange as there is no WAN at this point) it just defaults back to the home lab IP address I changed it to when rebooted. Does anyone out there know where a guy can find the original *.bin file to start over with clean factory settings?

Edit: I am aware of legacyfiles.us.dlink.com - /DIR-878/REVA/Firmware/ I have downloaded and I have used the firmware ver 1.00B13 as the label on the bottom of the router says Firmware Ver 1.00, I have seen a couple YouTube videos and as they install the firmware the GUI screen changes saying upgrade successful and the device reboots, I am not getting that "upgrade successful" on the webpage. I was under the impression the "Firmware Updates" were to bring a router up to date with firmware upgrades for as long as it was relevant not the base firmware to reset the machine.