Firestar

Won't matter if you upload it, Ford doesn't change which OTA updates are available even if you send one in.

Ah, got'cha.  I'm not at all familiar with aftermarket stereos with GPS and backup camera support--I'm sure it is available, but you may want to consult with a local shop and see what they recommend and go from there.

I think this is what you are looking for:  https://www.infotainment.com/collections/oem-ford-edge-sync-radios-and-accessories/products/2011-2018-ford-edge-4-to-8-sync-3-touchscreen-upgrade?variant=12301078757412 

CyanLabs can help you downgrade if that's what you want.  Depending on the version of upgrade you received you could theoretically upgrade beyond the version that you were provided, which may also provide you with a solution as several things were fixed in the most recent available version (3.4.20196 is the newest one, 3.4.20136 is the one being sent out by Ford last I checked.)

CyanLabs has a perfectly usable solution for manually updating your maps and SYNC 3 software.  Works great, I've used it on several 2017 Ford vehicles with SYNC 3 installed (2.0 and 3.0, respectively.)

These are what came with my 2020 Ford ST.  Just white stitching, no unique branding.  I have the cold weather package so I have the all weather mats, but these were in the trunk as well.

https://ibb.co/xMZ4rzP