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June 13th, 2025 13:58
XPS 15 9570- TPM and PTT missing/ Not Found
Hi All
I've been through all the posts here and tried everything but the result is the same-'Not Found'.
I have the latest BIOS and it's set to UEFI but the same whether secure boot is on or off.
This started happening after Windows 11 Pro update and issues a warning at pre-boot.
BIOS has no reference to TPM or PTT anywhere.
Any new suggestions welcome, thanks, joe
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ejn63
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28.6K Posts
2
June 13th, 2025 14:20
Unplug the system and disconnect the main battery from the system board. Hold the power button for 30 sec.
Then reassemble and power up -- check again.
joeread
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June 13th, 2025 14:52
Thanks ejn63 this worked for me!
joe
itbojen08787f
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1 Message
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July 20th, 2025 17:48
Thanks ejn63 this worked for me to!
//itbojen
(edited)
Almighty1
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August 1st, 2025 06:42
I had this issue today an hour ago on my XPS 15 9570 with a new motherboard with the i9-8950HK from early June 2025 when my original i7-8750H motherboard died on May 28, 2025 due to the capacitor burning down and also burn whatever was right under the F5 key.
Before this, I held down power button for 25 seconds to reset the RTC CMOS which did not fix the problem.
The way I fixed it didn't involve opening up the computer.
I saw in the XPS 15 9560 thread here:
https://www.dell.com/community/en/conversations/xps/xps-15-9560-alert-tpm-device-is-not-detected/647f8477f4ccf8a8de357c51?commentId=6605e821d478b1269a47496c
Where it says:
1) Unplug AC Adapter cable, wait 1 minute
2) Hold down Ctrl+ESC while plugging the AC Adapter back in and system should turn on itself
3) It will show a BIOS Recovery Menu
4) Select reset bios back to default
In my case, I didn't do step 4 because I tried to memorize the post and instead select Cancel and it fixed it. #4 might be the correct choice.
This brought back the missing TPM setting under Security in the BIOS.