@lfb6 - thanks, I didn’t notice 
I guess this will need done via FPT, with unlocked FD or ME/FD/Service jumper, or pinmod.
@wildgunman - thanks for explaining about Intel Boot Agent, see now that makes sense 
File size exceeded??? Indeed? Is that the error you got, or are you questioning?? 
Anyway, I can update that for you manually too. I will also update the ME, you’ll need to check board over to see if you can find ME/FD/FDO/Service 2 pin jumper to allow ME reflash via FPT, or I can send you interim BIOS to use with ME Reflash enabled (Thus ME Disabled), so you can then FPT flash ME region possibly.
I checked your board images and PDF, you have ME HDR 2-3 pin jumper (J50 ME Recovery / ME Header recovery signal), but the PDF is not clear if this can be used as we intend, or even what it’s default position is. It’s on page 16 ftp://ftp1.tyan.com/doc/S5533_UG_v1.0a.pdf
Can you flash mod BIOS with the included AFUDOS? If you are not sure, best to send me FPT Dump.
I see you’ll need to disable SMI Lock and BIOS lock before you can flash mod BIOS with FPT, so maybe if you can flash mod BIOS with stock AFUDOS then maybe easier for you?
I assume you want the 1.01 BIOS used, correct? Hope so , moving forward with that, for now
Do you know how to use FPT? If yes, please send me FPT dump of your FD (FPTw.exe -desc -d fd.bin) and dump of your BIOS region (FPTw.exe -bios -d biosreg.bin)
I’m sending you V4 SPS ME Tools via PM, do not use willy-nilly wait for directions before you try to write anything, you can brick your board in one click easy.
FPT must be ran from Admin CMD Prompt - Select the folder that contains the exe, hold shift and press right click, choose open command window here (Not power shell)
If you are stuck on Win10 and cannot easily get command prompt, and method I mentioned above does not work for you, here is some links that should help
Or, copy all contents from the Flash Programming Tool \ DOS folder to the root of a USB Bootable disk and do the dump from DOS (FPT.exe -bios -d biosreg.bin)
https://www.windowscentral.com/how-add-c…creators-update
https://www.windowscentral.com/add-open-…menu-windows-10
https://www.laptopmag.com/articles/open-…ator-privileges