Dell xps 8940 bios

[stevetaylor]

hello everyone , I need your help,
I have a pc, xps 8940 does not work with cpu gen11 only with gen10.
I tried to update the bios but nothing changed.
I found bios bin on the internet which I programmed.
it works with it, but every time it starts,
the TPM not found error appears and the service tag is not saved in the bios.
after restart service tag window remaing clear. i attach original bios dump.
thank you. here some pics.

[hardware1]

Re: Dell xps 8940 bios

hello everyone , I need your help,
I have a pc, xps 8940 does not work with cpu gen11 only with gen10.
I tried to update the bios but nothing changed.
I found bios bin on the internet which I programmed.
it works with it, but every time it starts,
the TPM not found error appears and the service tag is not saved in the bios.
after restart service tag window remaing clear. i attach original bios dump.
thank you. here some pics.

Write your Service Tag.

[stevetaylor]

Re: Dell xps 8940 bios

Jjfsmh3

[hardware1]

Re: Dell xps 8940 bios

the TPM not found error appears and the service tag is not saved in the bios.
after restart service tag window remaing clear. i attach original bios dump.
thank you. here some pics.

There is something wrong with your dump file, upload the other file that works but gives you TPM and Service Tag error.

[stevetaylor]

Re: Dell xps 8940 bios

ok, on Monday I will read the original bios again, that one wich working correct with 10-th proccesor. Once again, my intention is to upgrade cpu from 10-th gen. to 11-th gen. When i install a new cpu not give me any errors, but no show image. What I noticed after the new processor is installed, the bios content is not the same. In a hex editor the differences are major. With this bios attached below, it gives me an image but the service tag is not saved and it starts with the TPM module not found error

[hardware1]

Re: Dell xps 8940 bios

ok, on Monday I will read the original bios again, that one wich working correct with 10-th proccesor. Once again, my intention is to upgrade cpu from 10-th gen. to 11-th gen. When i install a new cpu not give me any errors, but no show image. What I noticed after the new processor is installed, the bios content is not the same. In a hex editor the differences are major. With this bios attached below, it gives me an image but the service tag is not saved and it starts with the TPM module not found error

Here is your New BIOS, try it and let me know.
In the first boot you can go to BIOS Menu and insert your Service Tag.

[stevetaylor]

Re: Dell xps 8940 bios

thank you sir, in this moment am away, but monday
the first thing i will do

[stevetaylor]

Re: Dell xps 8940 bios

good morning sir, one step forward, in this moment the sistem work whit 11th gen. no tpm error, but service tag no memorize.

[stevetaylor]

Re: Dell xps 8940 bios

this happen on every start

[hardware1]

Re: Dell xps 8940 bios

good morning sir, one step forward, in this moment the sistem work whit 11th gen. no tpm error, but service tag no memorize.

As I said in Post #6 "In the first boot you can go to BIOS Menu and insert your Service Tag." After that you can Press ALT+F to exit Manufacturing Mode.

[stevetaylor]

Re: Dell xps 8940 bios

I followed your advice, the service tag is not saved

[stevetaylor]

Re: Dell xps 8940 bios

thank you for your effort

[hardware1]

Re: Dell xps 8940 bios

I followed your advice, the service tag is not saved

You must insert the Service Tag first then press ALT+F. I think you already pressed ALT+F before writing your Service Tag, so you need to re-programmer the chip, go to BIOS Menu, insert your Service Tag, save and Exit, then press ALT+F.

[stevetaylor]

Re: Dell xps 8940 bios

for this I need to rewrite the bios again or not?
so.
-rewrite-
-programming service tag
-saving
after restart
-alt+F
right?

[hardware1]

Re: Dell xps 8940 bios

for this I need to rewrite the bios again or not?

Yes, you need to re-flash the BIOS.

-rewrite-
-programming service tag
-saving
after restart
-alt+F
right?

Your steps is fine.

[stevetaylor]

Re: Dell xps 8940 bios

In left corner apear this error BAC6D992
otherwise nothing has changed, service tag remain empty. and (manufacturing mode active) still apears on every start. It bypasses these errors but it is annoying for the buyer.
maybe SIO is programmable?MEC1515-Z2 and not write over the old content? I do not know

[stevetaylor]

Re: Dell xps 8940 bios

is possible to insert a service tag direct into bios?

[hardware1]

Re: Dell xps 8940 bios

is possible to insert a service tag direct into bios?

Try this one. If the problem still present, you can try to update the BIOS from Dell website.

[stevetaylor]

Re: Dell xps 8940 bios

yes, the problem stii present , I updated the bios in two ways via windows and via .rcv, the ussue is still present.
now showing service tag , but only on self diagnostic tool

[stevetaylor]

Re: Dell xps 8940 bios

in my research i found somebody with the same issue , who talk about in this case is necessary to pach the bios . i dont know it's true. the pach cost is about 30$. Your opinion?