Anyone know how to downgrade ASUS X570 TUF BIOS?

555BUK

555BUK

555BUK

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Like a fool I flashed my ASUS X570 TUF Gaming-Plus BIOS to latest official version 2607. The BIOS comments said that it fixes fan issues, which I was experiencing on original 1407 BIOS.

Anyways, post-flash the system is experiencing cold-boot issues whenever I set IF above 1800MHz. Previously everything was happy at 1900MHz, with my ram in-sync @ 3800MHz.

I have tried every setting/combination available on the mobo, but upon every single cold-boot the system simply will not startup above IF 1800MHz, and requires a BIOS reset. Warm starts/reboots work fine @ 1900, and all benmarks and tests pass fault-free. Also, running RAM out of sync @ 4200/1800 is fine, so I know the limitation is related to IF-speed only. I guess the new BIOS is somehow limiting IF-voltage during startups.

So, does anyone know how to force a downgrade-BIOS on this mobo, as ASUS EZ-Flash does not allow downgrades?

Edit: Problem found! After a BIOS has been flashed, ASUS is writing something to the USB drive that prevents same BIOS from being flashed again. I have tested and repeated the problem several times using different USB drives and different freshly-downloaded BIOS'.

Solution
1. Freshly format a USB drive in FAT32.
2. Download a FRESH BIOS from ASUS and save to USB
3. Enter BIOS, start EZFlash Utility and flash-away.

#Note: I am unable to flash exactly the same BIOS twice. For example, if I downoad both 1407 and 2607 BIOS' to a freshly-formated USB then I can flash one or both files once-each. If I try to flash either file a second-time I get an invalid-file error. BIOS needs to be freshly-downloaded again before I can reflash.
 
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Slinky69 said:
I have never done it, but the best link I could find was this one:

https://rog.asus.com/forum/showthre...-in-DOS-with-USB-tutorial-Intel-AMD-roll-back

Pretty scary-looking stuff though!
Click to expand...
Thanks for the suggestion. I checked the linked-video comments on youtube, and plenty of people say this procedure doesn't work on X570 boards due to larger BIOS size.

On the positive-side, running my memory in sync @ 3600/1800 allows tighter-timings than 3800/1900, providing almost-equal bandwidth. We're probably talking less than half of one-percent difference within the real-world, but it still bugs me that a BIOS-upgrade decreases performance and stability.
 
Try renaming the bios file to the most recent but just add a 1 on the end of the number and see if this works. So 26071 etc.
 
Joxeon said:
Try renaming the bios file to the most recent but just add a 1 on the end of the number and see if this works. So 26071 etc.
Click to expand...
No joy. The mobo must check the embedded AGESA version, and simply sees older BIOS' as invalid.

I guess that I'll have to wait for the next official BIOS release, and hope that solves high-IF cold-boot problems,
 
opethdisciple said:
You can try inching the speed up in small increments. I remember this was a thing on my x370 board when I was struggling with ram stability.
Click to expand...
I have had to do that to get up to 3600MHz..

I have a workaround. From cold-boot anything above 3600/1800MHz will fail every-single time. Fans spin-up, but then the PC just sits there doing nothing. If I then press the restart button, system will post as-normal. Also, suspend & resume works fine. It's just a nuissance when things were fine @ 3800/1900 on previous BIOS, and when system is rock-stable @ 1900 once I get past a cold-boot.

I take consolation from there being little real-world difference between 1800 & 1900 IF, and the hope that ASUS revert whatever changes they made within next official BIOS.

Moral of the story - Don't upgrade BIOS' unless you really-really have to.
 
555BUK said:
I have had to do that to get up to 3600MHz..

I have a workaround. From cold-boot anything above 3600/1800MHz will fail every-single time. Fans spin-up, but then the PC just sits there doing nothing. If I then press the restart button, system will post as-normal. Also, suspend & resume works fine. It's just a nuissance when things were fine @ 3800/1900 on previous BIOS, and when system is rock-stable @ 1900 once I get past a cold-boot.

I take consolation from there being little real-world difference between 1800 & 1900 IF, and the hope that ASUS revert whatever changes they made within next official BIOS.

Moral of the story - Don't upgrade BIOS' unless you really-really have to.
Click to expand...

Coincidentally my x370 board was an Asus too.

Haven't had any problems with my Gigabyte.
 
Problem found - see original post edit for details.

Now back on 1407 BIOS, and system is happily running @ 3800/1900 again.
 
Wow, that's weird! I wonder if you could use the same USB to change the BIOS on 2 different motherboards? If not, that could really confuse people!
 
I'm just happy to be at 1900 IF, with zero cold-boot issues and 100% stability again.

pkI4cNb.jpg


Here are a few benches I did between original 1407 and latest 2607 official BIOS'
lkS0GyM.jpg


Above results are with all BIOS stock-settings, apart from tightened memory-timing and voltage adjustments (auto CPU volts w/ -0.1V offset, DDR4 @ 1.45V, SOC @ 1.025V). Just one benmark-run each, so some margin for natural-variation.

Full System:-
Ryzen 3900XT, ASUS X570 TUF, 16GB Trident Z 3866MHz (Samsung B-Die), MSI Gaming X 5700 XT, Corsair HX850 PSU, Corsair MP600 NVME SSD, Corsair H100 240mm AIO, Meshify C case.

Conclusion
1407 BIOS is faster at same clocks, plus allows additional 66-100MHz IF / 133-200MHz DDR overclock with same components. Overall, 1-2% faster than latest 2607 BIOS.
 
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