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P620 SVP reset does not work

2021-04-06, 9:36 AM

I had to set a supervisor password to enable Device Guard in UEFI.

Now I cannot remember the password anymore...

 

I tried to reset it by using the clear CMOS jumper as described here:

Wie kann ich das BIOS-Passwort auf meinem ThinkStation zurücksetzen?-Deutsche Community (lenovo.com)

 

SVP reset by jumper is allowed in UEFI settings - but it does not work...

It takes a bit longer to boot, time and date in CMOS is cleared - but it still asks for a password.

 

 

BIOS-Version/-Datum    LENOVO S07KT1BA, 26.03.2021

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1097 Posts

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Re:P620 SVP reset does not work

2021-04-07, 18:10 PM

I just tested this out on my P620 system with the latest system BIOS S07KT1BA from the P620 support site and it seems to work for me.  Here's my steps taken:

 

1. Boot into BIOS F1 setup, go to the "Security" menu option, and select "Set Supervisor Password".  Enter a password and press F10 to Save and Exit. 

 

2. As the system is rebooting, press F1 to enter BIOS setup.  Notice, it asks for a supervisor password to enter BIOS setup. 

 

3. Shutdown the system, unplug AC power, and move the clear CMOS jumper over from the right-most pins to the left-most pins. Note, the clear CMOS jumper should be directly above the PSU. 

 

4. Plug AC power, turn on the system, and wait until you hear 2 beeps. 

 

5. Once you hear 2 beeps, unplug AC power and return the clear CMOS jumper to the original position. 

 

6. Plug AC power, turn on the system, and the system will eventually give you BIOS post code error beeps (2 longer beeps).  This is normal.  Press F1 to enter BIOS setup and note that it doesn't prompt you for a supervisor password.  Then, press F10 to Save and Exit BIOS to continue booting the system.  

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Re:P620 SVP reset does not work

2021-04-06, 13:41 PM

I would have thought that clearing CMOS would reset the BIOS admin password.  Let me check this out on my P620 system and get back to you on this. 

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02-22-2010

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Re:P620 SVP reset does not work

2021-04-07, 17:19 PM

Just to confirm, are you certain you initially set a supervisor password and not a HDD password?  As mentioned, supervisor passwords should typically be able to be cleared by clearing CMOS.  But HDD passwords will not be cleared by using that procedure.




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Re:P620 SVP reset does not work

2021-04-07, 17:43 PM

Yes, I am sure. 

 

 (Get-WmiObject -Namespace root\wmi -Class Lenovo_BiosPasswordSettings).PasswordState    returns 2.

 

What I am not sure about is if the clear cmos by jumper worked at all. Date and time might got cleared by my attempt to remove the cmos battery.

I switched the jumper "43 Clear CMOS / Recovery jumper" which is mentioned here: P620 Hardware Maintenance Manual (lenovo.com)

And I tried it 4 times... No luck so far.

 

 

 

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Re:P620 SVP reset does not work

2021-04-07, 18:10 PM

I just tested this out on my P620 system with the latest system BIOS S07KT1BA from the P620 support site and it seems to work for me.  Here's my steps taken:

 

1. Boot into BIOS F1 setup, go to the "Security" menu option, and select "Set Supervisor Password".  Enter a password and press F10 to Save and Exit. 

 

2. As the system is rebooting, press F1 to enter BIOS setup.  Notice, it asks for a supervisor password to enter BIOS setup. 

 

3. Shutdown the system, unplug AC power, and move the clear CMOS jumper over from the right-most pins to the left-most pins. Note, the clear CMOS jumper should be directly above the PSU. 

 

4. Plug AC power, turn on the system, and wait until you hear 2 beeps. 

 

5. Once you hear 2 beeps, unplug AC power and return the clear CMOS jumper to the original position. 

 

6. Plug AC power, turn on the system, and the system will eventually give you BIOS post code error beeps (2 longer beeps).  This is normal.  Press F1 to enter BIOS setup and note that it doesn't prompt you for a supervisor password.  Then, press F10 to Save and Exit BIOS to continue booting the system.  

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Re:P620 SVP reset does not work

2021-04-07, 18:13 PM

Right above the PSU? Does this mean the hardware maintenance manual is wrong?

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Re:P620 SVP reset does not work

2021-04-07, 18:29 PM

Oh, I just double checked this against the hardware maintenance manual and I think I understand what the confusion is.  Let me check with our internal team to verify which is the correct jumper to use.  

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  • Message 8 of 10

Re:P620 SVP reset does not work

2021-04-07, 18:45 PM

Possibly.  We're checking into that now.  But based on testing @mebsterbball did and a quick check of the board schematics, I'd say JP58 (near the PSU) is the one that is correctly functioning as the Clear CMOS jumper.  Should be no harm in using JP58 and following the steps mentioned above while we confirm this in the background.




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Re:P620 SVP reset does not work

2021-04-08, 5:29 AM

Thanks!

 

JP58 works! SVP is cleared.

Someone should fix the manual...

 

 

 

 

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Re:P620 SVP reset does not work

2021-04-08, 11:34 AM

Just for verification and reference, I was able to confirm with the internal BIOS team that we should be using JP58 (jumper just above PSU, lower left corner) in the P620.  This is also known as the "SW Clear CMOS", whereas, the jumper just above PCIe Slot 3 is a "HW Clear CMOS".  Yes, we'll work to get the HMM and User Guide updated. 

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