I don't understand the reference link you sent. I'm not a coder, so that link takes me to a bunch of code, am I supposed to run that code? Where would I run it, how do the files in the HT-Flash folder relate to this code?
I went back to read from the post you recommended, and this is my conclusion
First, I assume that the files you provided (via google drive) are backup OEM files for the MT02, and I should use my own MT04 backup files instead (from HT-Flash folder).
I also found this post for reference on flashing via TFTP: https://forum.archive.openwrt.org/viewtopic.php?id=53014&p=13#p293127 however that is not for flashing the OEM firmware but rather openwrt.
So, I have the following files in the HT-Flash folder (removed openwrt.bin as you suggested)
From what I understand, I can just join them in windows like this: COPY /B File1.bin + File2.bin file3.bin > Kernal.bin
Have a TFTP server running on 10.10.10.3 with Kernal.bin in the root folder.
-Power off the router, connect everything (via switch or direct), start tftpd
-Press and hold router reset pin with paper clip. While holding reset then press and hold router power button. Wifi LED should light up then go out again, 3-5 seconds.
-Continue holding reset and release power. After another 10-15 seconds you should see 10.10.10.123 looking for tftp on 10.10.10.3. Now you can release the reset pin.
-If tftp is running the Kernal.bin file will upload right away and you'll see the upload in tcpdump.
It can take another 3-5 minutes for the firmware to install. Let it sit for a while, up to 10 minutes, then power cycle the router. It should boot up on default config for OpenWRT.