So after poking around with the bootloader, I decided to go look for the stock firmware to see if I could upload that with some modifications so I could play around with the stock system.
After a night of Googling, I couldn’t find any links to the original firmware. I tried to discover if I could download the firmware from the NAS, but that didn’t get me anywhere either. All the Googling did point me in the direction of SnakeOS however, which is replacement firmware for some NASes. However, it hadn’t been maintained in quite a few years so I was initially a bit hesitant.