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G5 running Windows 11 suddenly complains about not having TPM 2.0
I've had this Dell G5 with an Intel i7 for a few years and it's been running Windows 11 just fine from 2023 until a week ago. I've been doing updates regularly, then Windows Update started complaining about not having TPM 2.0 and not meeting the minimum requirements. Obviously, my machine is compatible, but it seems like Windows 11 just lost the ability to see that.
So here's what I've done thus far:
- tpm.msc confirmed "Compatible TPM cannot be found".
- After some digging, it looked like I needed to turn on PTT in the bios. My understanding is that PTT is Intel's TPM system, and it was turned off.
- I went to toggle PTT on, and it complained that I had to turn off Legacy Option ROMs, which I've never heard of, let alone changed.
- I went to toggle Legacy Option ROMs off but I got a big warning: “Attention! Changing this setting may prevent your operating system from booting or require a reinstall. Are you sure you would like to continue?”
- That seemed intimidating and I didn't want to brick my computer, so I looked for alternatives and tried the registry trick that Windows offers to ignore TPM. Again, Windows Update failed because I did not have TPM 2.0.
- Now Windows Update is saying I should try a repair version (Windows 11 23H2), so I tried that, but again, it complained that I lack TPM 2.0.
Any recommendations at this point? I feel like Legacy Option ROMs is the root issue here, but if I turn Legacy Option ROMs off, then PTT on, and my computer doesn't work, will I still be able to boot into the bios and flip them back?
jamie.thul
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November 13th, 2024 03:34
Thank you for the advice - GPT vs MBR were something I had no idea about and that was the confidence I needed for turning off Legacy Option ROM. I verified that my drive was GPT instead of MBR, turned off Legacy Option ROM, turned on PTT, and everything is working now.
Chino de Oro
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November 13th, 2024 00:06
If your system was shipped with Windows 11, it should be installed with UEFI mode and you don't have to worry about trouble booting after turning off Legacy Option ROM.
If you or someone have installed Windows 11 with Legacy mode, the boot drive may have MBR boot mode and it may experience boot issue if you turn off Legacy Option ROM.
If you verify your boot drive is MBR, just search for mbr2gpt for a quick conversion without reinstalling the operating system.
I suggest a completely out of the box solution. Since the new Windows 11 24H2 is the latest release and you may face some issues with new Windows update, you can wipe your boot drive and perform a clean Windows installation with the latest 24H2. Of course, you should taking all preparation steps such as ensuring you have all your backup data in place, Restore your BIOS settings to default and verifying that it matches with Windows 11 requirements: UEFI boot mode, Secure Boot on, TPM on.
A new Windows installation and drivers update may take about 30 minutes. Another hour to repopulate your applications and data. That's sure beat all the troubleshooting time and uncertainty result.