Tpm device not available

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Our Latitude 5490 did a Win 11 update and now on boot up we get

TPM Device not detected

I checked the bios and nothing shows for TPM

Latutude 5490

BIOS 1.39.0

Build 4306.30

UEFI ROM

ePSA 4306.30 VAL Code 109874

Please advise how we can fix this

I just went through this TPS issue on my 5580; After not finding a single post that fixed it, I came up with one- Here goes:

First, download the latest BIOS for your laptop then right-click it- a fly out menu will appear, left-click Run As Administrator (RAA). Let it load and restart to update (or overwrite the same existing version if it was previously loaded); When it's completely done with the flashing process and reboots to the TPM error message, press & release the power button- the laptop should power off within 10 seconds. If it doesn't power off, press and hold the power button until the laptop shuts off.

The next steps might be a little different for your particular model but here's what absolutely worked on my 5580 running Win11 with an M2 SSD:

1. Unplug the power pack from the laptop port.

2. Turn laptop over & loosen the 8 screws (the screws are captive on my model- each screw took about 5 complete turns to unscrew), then pry the bottom cover off, starting along the back of the laptop. NOTE: A guitar pick or used-up gift card works well as a pry tool to get the panel to seperate from the laptop;

3. Once the bottom cover is off, look for the BIOS battery and the main battery & unplug them both. NOTE: The BIOS battery has a flimsy small connector that needs to be carefully removed by using tweezers or 2 small flat blade screwdrivers to push the shoulders of the plastic connector at the same time to disengage it- pulling on the wires is risky because they can and will snap out of the connector; Also, maintain control of the tools so you don't slip and damage the motherboard; The main battery plug has a built-in finger strap disconnect- pull it straight up off the connector.

4. With the power pack disconnected and both of the batteries unplugged, press & hold the power button down FOR A FULL 30 SECONDS. This will wipe out the bad TPM configuration, allowing proper reprogramming.

5. Stand the laptop on its' side and plug in the AC adapter to the laptop; The laptop should power on as soon as you connect the power pack- wait a solid 3 to 5 minutes for it to cycle through an initialization process; When the initialization is complete, it will boot up to a Setup Error: Time & Date Not Set; Press & release the power button- the laptop should shut off in a few seconds.

6. Leave the power pack connected: Close the screen & lay the laptop down so you can carefully reconnect the BIOS & main batteries.

7. Once the batteries are reconnected, put the bottom cover back on. NOTE: When the cover is ready to be screwed back down, push firmly along the front edge of the cover- it should click a couple of times as the locater nibs engage, then tighten the screws.

8. Flip the laptop right-side up, open it & turn it on; It will boot to the Time & Date error- Press the F2 (2nd key in from the Esc key) to enter BIOS setup.

9. Click the Restore Settings button on the bottom-right side; the laptop will restart.

10. Once it comes back up, it may have the Time & Date error again; if so, press the F2 key to enter BIOS and set the clock. Then click Exit and Save if it asks if you want to save.

11. Done.