08-15-2016 04:32 AM
The built-in "Lenovo Update" agent program recommended a BIOS update v1.23 (it's a critical update), so I did. And then my system doesn't boot: it's hangs on the "Starting Windows" logo page (Windows 7 64 bit).
So I am trying to rollback to the last working version v1.21. Confirmed that my machine is type 20CL, went here, go the bootable CD, successfully went to the BIOS Update Utility, and then it said: "system program file is not correct for this system"
The followings settings in BIOS were applied to try enable a rollback of BIOS but failed...
* I am sure:
- my download was correct
- no issue on handling the ISO burning to CD
- this has nothing to do with Windows or operating system
Any idea folks?
I really really need my system back...
Solved! Go to Solution.
08-15-2016 08:52 AM
08-15-2016 08:38 PM
Thanks for the message. This clears my doubt why I wasn't able to rollback to BIOS v1.21, this is by-design then, though I am not sure if this is a handling that makes sense: in case of problem after update there should be a way out... "security improvement" is not a very good reason for me...
* So this BIOS v1.23 update is a one-way ticket *
So problem remains, it's the classic classpnp.sys hangs issue. I cannot rollback BIOS, there is no option to switch to IDE / ATAPI mode. So I am basically stuck. Seems to me the only sure-to-work way would be a system re-install....
Any alternatives as you can see folks?
My hearty thanks.
08-15-2016 10:21 PM
I don't have my ThinkPad X250 in front of me to confirm this, but I'm wondering if there is an option somewhere in the BIOS to enable Legacy or CSM mode instead of pure-UEFI for the firmware type. Enabling this may allow Windows 7 to boot as it normally would.
08-17-2016 02:15 AM
Can you try all the permutations of UEFI/Legacy Boot to see if one of those works?
08-17-2016 05:57 AM
T450 and T450s customers have reported similar boot up issues after upgrading to BIOS v1.25.
They identified a workaround: boot into BIOS, tab Security -> Memory Protection -> option "Execution Prevention" and disable it. However, please be advised this disables DEP.
That discussion can be found here: https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/T450-Windows-splash-freezes-after-BIOS-u...
I have escalated this issue to Think Engineering.
08-17-2016 09:36 PM
Really glad for all the support here. This is the most responsive manufacturer forum I have ever experienced
@Aryeh Goretsky: tried all permutations of UEFI/Legacy Boot, no luck there
@Amy Tupper: unfortunately I did not have chance to try out your suggestion. I moved on to do full system re-installation before noticing your message. I could not afford the down-time so moved on to the tedious but guarantee-to-work way to resolve this. I am now typing on my X250. Wish Lenovo can release a new BIOS version which does enable user to downgrade from there. So fellows like me can first upgrade to say v1.24, then downgrade to v1.21 from there.
@fb1996: I am taking your reply as the solution.
08-18-2016 04:56 AM - edited 08-19-2016 04:15 AM
I am having the same problem after the BIOS upgrade to v1.23. I can choose the OS in the GRUB bootloader, but as soon as the OS is started (Windows 10 or Linux), the notebook freezes.
I will try to disable "Execution Prevention" this evening to see whether it helps..
Edit: Disabling "Execution Precention" helped. I really hope this bug is going to be fixed as soon as possible...
08-20-2016 01:44 AM
Thank you all! It saves my life...
Here is my problem: