Hi Misha32,

Thanks for posting.

Intel has given Dell information not to downgrade the BIOS if you updated it due to the Intel security issue.  They will be releasing more information in the near future and another possible update at that time. Thanks for your patience.

No that's the real answer. If you have already updated the bios with the version that has been pulled now. Your only option is to wait until a new one is released. I've gone through all the options and have had no luck. Apparently the Spectre fix had microcode to protect from anyone downgrading back. Was this a design flaw, or done purposely? Not sure, but its pretty clear if you have already performed the bios upgrade your stuck with it until Intel and Dell can revise a bios that fixes the fixes that were not fixed. If that makes any sense? 

hello,

more information about microcode issue : http://www.zdnet.com/article/spectre-of-unpredictable-chips-makes-intel-recommend-halt-of-its-patchy-patch/

a new fix will be release asap (i hope)

I have a DELL T1700 with a Intel i7 4790 Haswell CPU, which i updated last week with BIOS A24, which was online on the website last week. Since then i've experience a lot of BSOD SYSTEM_THREAD_EXCEPTION_NOT_HANDLED and constant WHEA ID 19 processor kernel parity errors.
Yesterday i checked again and now only A23 is online, so A24 been withdrawn. In this moment A24 is still available throud DELL SupportAssist software. Nevertheless i downgraded back to A23, which didn't improved the problems.

I now downgraded back to BIOS A06 from 2013, which is as old as the computer is. After that i didn't had the error immediately (not up to now), and additionally i flashed A23 on top of A06 again. Still no problems so far.

But the final solution would be needed from Intel and DELL, with a newer BIOS.

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@FXCP wrote:
I now downgraded back to BIOS A06 from 2013, which is as old as the computer is. After that i didn't had the error immediately (not up to now), and additionally i flashed A23 on top of A06 again. Still no problems so far.

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Nice! That gives me some confidence that I can get back to the previous microcode, even if in a roundabout way.

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@robert p wrote:

Hi Misha32,

Thanks for posting.

Intel has given Dell information not to downgrade the BIOS if you updated it due to the Intel security issue.  They will be releasing more information in the near future and another possible update at that time. Thanks for your patience.

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Thanks for your reply, appreciate it.

I understand Intel's position and advice, but I disagree with it. I feel that the risk of instability and data corruption is not worth taking, which is why I want to downgrade the microcode.

There must surely be millions of people who haven't installed the buggy microcode, and who now *can't* install it because it's been pulled... I'd rather be in that camp for the time being.