Ok I got it to take the firmware. Complete read for anyone looking for solution to similar problem:
So, once it was not booting (stuck on logo screen not loading) I had to flash the stock firmware to get it going again, here: SV04 | Sovol 3D Printer Wiki . Made sure the printer worked, (edit: by make sure it worked, I mean set it up and ran many prints on it. Smooth sailing.) then formatted a fullsize sd card and flashed the 1.14.2 firmware, Release SV04-IDEX-3D-Printer-Marlin-firmware-v1.14.2 · Bjoern70/SV04-IDEX-3D-Printer-Mainboard-Source-code · GitHub , made sure the file on the sd card ended in .cur.
After that was confirmed, using a 128gb microsd card I used disk management to create a new simple volume 7578, then followed those manufacturer directions: Go to start> run >cmd Type in command: format/q g:/ fs:fat32/ a:409 6 (Note: q is followed by a space, g is drive letter of the card, substitute your own). Hit enter through prompts. All cards up to 128gb xc1 have worked for me reliably now with this method, though the manufacturer cautions that above 16gb capacity those cards might not work. I did have to go through all these steps twice, the first time the screen showed that the firmware had taken, but when I power cycled the printer it did not show the expected menu items, and the preheat options still showed pla/abs.
If something isnt working, redoing the partition and the command formatting steps seems to work, don’t know why, just repeat it a few times and see what happens.
If both updates worked, both version numbers will appear on the printer info screen. If only one appears, you’re missing something. If something goes wrong, partition/format, put the stock firmware onto the full size card and flash it, and after confirming the file changed to .cur, partition/format the microsd card and use the stock dwin from the wiki above, make sure it’s not all zeroes on the blue screen, and the menu options and version numbers in the printer info make sense. If anything seems wrong, start from scratch, formatting/flashing main, confirming, then formatting/flashing screen, and confirming.
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@Bjoern , thank you for your help, its uncommon someone supports a firmware file to this degree. If you have a donation page where I can buy you a coffee or send beer money, send it my way. I really appreciate your time and effort, thank you.