@Draver - yes, AFU w/ /GAN and regular AFU sometimes can appear to flash fine but actually flash nothing. There is several other methods to try outlined here [Guide] How to flash a modded AMI UEFI BIOS (27)
I suggest my method using FPT since this is Intel system, please pay attention to the warning on my guide! My method is linked at end of #2 in above page

@Axle - there is plenty of AFUxxxx for Aptio 4 and 5, maybe not at AFU's site, but they are out there (even v5 w/ /GAN option as you mentioned).

The link in the 1st message is dead:

Zitat

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We are sorry. Your file does not exist. Please contact your AMI representative.

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Even when it wasn't dead there was only utility for AMIBIOS, not for Aptio 4/5.

This topic is called

Zitat

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[Guide] Flashing modified AMI Aptio UEFI using AFU

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but there is no information about new versions of AFU without /GAN parameter.

I do not know why the found version is 5. The modified date is 2014-01-22 14:51:22. The newest version at AMI site is 3.09.X for Aptio 4.

Thanks @Axle - it's not dead, it just needs links updated since they moved things around (Tested and downloading) @CodeRush -
Aptio IV (3.09.03.1462) - https://ami.com/en/?Aptio_4_AMI_Firmware_Update_Utility.zip
Aptio V (5.11.06.1854) - https://ami.com/en/?Aptio_V_AMI_Firmware_Update_Utility.zip

AMIBIOS8 version links are there too if anyone needs it, this was never the original linked file, I've downloaded from the OP link before and it was Aptio V I believe.
https://ami.com/en/?AMIBIOS8_AMI_Firmware_Update_Utility.zip

Anyway, that is why link does not work now, they re-arranged their site. Links are above for now, until CodeRush adds the new links
There is never any information about /GAN that is ES/Engineers version/information, not meant to be public so they don't post stuff like that at their site.
There's no new info needed, same applies you either have the version that allows /GAN or you don't, there is versions that work with /GAN for Aptio IV and V

Zitat von Lost_N_BIOS im Beitrag #198

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Aptio IV (3.09.03.1462) - https://ami.com/en/?Aptio_4_AMI_Firmware_Update_Utility.zip

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@Axle - Obviously! No publically available version from AMI will have /GAN and we can't link the ones that do here - did you read what I said about that?

Links are correct for downloading public AFU Files, AMI site has been changed, for now new links are above CodeRush will update links when he gets my notification above. You already have latest version that allows /GAN for Aptio V, so no need to look further, that is all there is (The one you mentioned).
If you need for Aptio IV, google for AFUDOS 3.06.01 or send me PM. Page 4 of this thread has link to 3.04 version that supports /GAN, but 3.06.01 is out there, maybe better results for you if you don't use Google.
AFU is not very reliable and outdated method of flashing BIOS. What is your motherboard, if Intel based and at least semi-modern (has Intel ME) I can help you flash in much easier way.

This guide is several years old, and should probably be removed because /GAN method is a legacy of dark ages, and doesn't work for newer boards. I wrote it because of a promise given to Fernando, and already asked him to remove it once (because of people breaking their systems by following the guide).
Here is my second try: @Fernando, please consider removing this guide as both dangerous and severely outdated.