Benson, you need to take a break from this for a while. Do as much reading up on the update process as you can. YouTube, DJI Manual, & the forums, this before trying a bunch of things that may only create a bigger issue than you started with, if I may be so bold.
I'm not by far an authority on the download/update process, but if memory serves me correctly, the AC updating process using the USB port had been eliminated after FW version 1.3.20 as I believe the process is accomplished using the GO App. from that point forward, someone correct me if I'm mistaken here.
In any regard, my understanding or way I've updated the equipment is that the aircraft is usually updated first, and then the radio controller using the specific guidelines outlined in the manual.
You may also want to always first confirm the S/W & F/W versions you presently have loaded on the various devices by checking the ABOUT section in the Go App. as a general rule of thumb, this before all the mumbo jumbo techniques are performed, in which case may only be making a bad situation worse.
You may now find that you will somehow need to wipe the slate clean, so to speak before proceeding. In that I mean, uninstalling the Go App, reformatting the SD card, and resetting the AC via the App. if possible, so you may start fresh and not create obstacles in the new download process.
Again, before you begin, check all the sources previously mentioned, and or give one of the authorized repair dealers a shout out to reconfirm your options.
All the best in rectifying your present situation. : )