Sorry for the double-post, but I believe this would be better as a separate post altogether compared to an edit.
I just got my shipment of jumper cables so I could finally play around with this board, and have successfully got it into recovery mode without the reset switch just like ericsename has figured out. Here are some detailed instructions.
Firstly, you must identify the solder points that need to be shorted to mimic pressing the reset switch. You'll want to take the PCB out of its enclosure so you have access to its internals, and then identify where the reset switch is supposed to be located, which is right behind the AV input. You'll see two holes surrounded by four solder points on the board. In order to boot the device into recovery mode (or whatever it's called, I'm new to Amlogic stuff) you need to short the two solder points that are closest together. These are the solder points that are below the holes if you orient the board with the AV input on the top.
Next, let's actually put the board into recovery mode, which can be done as follows:
- Optionally, connect the board to your computer using a male-to-male USB cable, or a USB to USB-C cable if your PC supports the connection.
- Using a male-to-male jumper cable, touch each end to one of the solder points.
- Without removing the jumper cable, plug in the power supply to the PCB. (This is the hardest part!)
- Wait until you're sure the board is in recovery mode. Some boards will show the Android-recovery-droid-thing. You can also wait until 5 seconds after USB Burner Tool detects the board.
That's it! I hope this helps you guys.
P.S.: I'm new to this forum, and I don't know if this is worth posting as a separate thread. If so, please let me know! Thanks. 
Update:
If, for whatever reason, you're using USB Burning Tool to flash an image to NAND, you don't even need your reset button! Again, I'm new to this so maybe you all already knew this, but if you follow these directions you can flash your firmware image without touching the reset switch:
- Plug USB-to-USB in to the box and PC.
- Start up USB Burning Tool, load the image you want to flash, and press the Start button.
- Plug in the power supply for your box. USB Burning Tool *should* automatically start flashing the image to your box.