Dell E5420 Secure Manager

If the seller can't clear the system for you, ask for a refund.  Otherwise, you're adding the cost of a replacement mainboard to the purchase price, as it'll be required to clear up the problem.

Please any help or suggestion... 

The whole purpose of a TPM is to prevent access to the system and its data if it's lost or stolen.  A back door would defeat the purpose of the technology.

Some kind of backup for that kind of systems should exists... For any system with that kind of protection... 

Any system with an enabled trusted platform module will have the same issue unless the person who owned/set the security system clears it.

This goes for any system - not just Dell systems.

Can't believe i was so stupid to by something that didn't saw first with my own eyes... My mistake, my problem... Just can't believe that if someone lost that passwords, only solution was replacing whole motherboard... I was reading on the internet about this problem... well, my opinion, that is just big flaw from the dell....

After a couple of days i found the solution for my problem, if someone else have the same problem here it is:

Remove main battery,

Open laptop (couple of screws),

Locate eprom chip "Winbond 25Q32BVSIG" (password was stored in that chip),

Short circuit 3 and 6 pin on it (any wire should do the job),

Connect only power adapter (not the battery),

And press power button...

Hope this would help someone else...

Best regards....

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I recieved couple of questions in inbox about the name of eprom chip so here it is... Probably on other models have different mark, but the principle is the same... 3 and 6 pin should be short circuited...

Eprom chip that stored password is Winbond 25Q32BVSIG...