How To Update Serial Number In Bios Lenovo T420

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Look for bios updates for your laptop on the Lenovo site. If it is a recent laptop, most vendors will have an update sooner or later. For IBM/Lenovo ThinkPad laptop enthusiasts. New Bios Thinkpad Question Re: Update Thinkpad BIOS or Update Model Number. I was going to update to the latest bios that L. Vantage told me about a week ago when I was given the option of 'Update BIOS or Update Model Number.' I had no idea which one I should choose so I exited out.

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Hi guys, my laptop had a problem 2 weeks ago with constant freezing and lag, I sent in to repair and they replaced the motherboard under warranty. When I got the unit back, the BIOS is at an older version which the system update tool recommended me to upgrade and after it finished and rebooted the exact same problem is back. Currently the problematic version is 83ET70WW 1.40.

I think the old one was 1.15 or something like that. When theres no problem, my memory runs at 1600MHz and after the bios update supposedly both times, the RAM under clock itself to 1333MHz and the freeze+lag comes back. I have never done a downgrade before so coming up here to look for some pro advice. Thanks for helping! Also which version would be a good one to downgrade to? Since 1.15 seems too obsolete now.

EDIT: my memory is 8gb Kingston HyperX 1600 PnP (2x4G). Code: Summary of Changes Where: Package version UEFI: UEFI BIOS version ECP: Embedded Controller Program version [Important] Important update (New) New function or enhancement (Fix) Correction to existing function UEFI: 1.40 / ECP: 1.19 - (Fix) Fixed an issue where specific hard disks might not be detected after resuming normal operation from standby/sleep state. - (Fix) Fixed an issue where an unnecessary fan error message might be shown.

UEFI: 1.39 / ECP: 1.18 - (Fix) Fixed an issue where incorrect battery capacity might be shown in some battery benchmark programs. - (Fix) Fixed an issue where the computer failed to resume normal operation from hibernation state after running Setup Defaults by the F9 key in the ThinkPad Setup menu. - (Fix) Fixed an issue where the Power-On NumLock function in ThinkPad Setup did not work. UEFI: 1.37 / ECP: 1.11 - (Fix) Fixed an issue where the Intel Pentium CPU models might fail to resume normal operation from standby/sleep state.

- (Fix) Fixed an issue where the maximum number of password attempts through WMI was not 3. UEFI: 1.36 / ECP: 1.11 - (Fix) Fixed an issue that might return a time-out error in SATA compatibility mode. - (Fix) Fixed an issue where the UEFI BIOS might not be updated correctly when running the BIOS update after resuming normal operation from standby/ sleep state.

UEFI: 1.35 / ECP: 1.11 - (New) Improved memory resource allocation process to reserve more memory space for optional hardware devices. - (Fix) Fixed an issue where some keys of the external USB keyboard might not work correctly on PBE of McAfee Endpoint Encryption software. - (Fix) Fixed an issue where intranet account login might fail with ThinkVantage Hardware Password Manager.

UEFI: 1.34 / ECP: 1.11 - (Fix) Fixed an issue where the computer might fail to boot when connected some Smartphones with the USB port. The following smartphones were tested: Motorola: Droid 2, Droid X HTC: Nexus One, EVO, Droid Incredible, Droid Incredible 2, ThunderBolt, Aria Samsung: Captivate, Galaxy Tab UEFI: 1.34 / ECP: 1.11 - (New) Improved system performance when a heavy software was executed with the 65W AC adapter. - (New) Added support for some USB keyboards with a fingerprint reader. - (New) Added support for the option to change product name and version format in SMBIOS. - (Fix) Fixed an issue that might cause slow system boot. - (Fix) Fixed an issue where the computer might fail to boot when connected some Smartphones with the USB port.