Forum RSS Feed Follow @ Twitter Follow On Facebook

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
[-]
Welcome
You have to register before you can post on our site.

Username:


Password:





[-]
Latest Threads
[REQUEST] GL504GS BIOS unlock
Last Post: pl4gue
Today 12:19 PM
» Replies: 75
» Views: 59000
[REQUEST] Lenovo V580(c) (H1ETxxWW) Whit...
Last Post: mansur.sh.n
Today 10:38 AM
» Replies: 587
» Views: 147423
[REQUEST] Acer Aspire S3-391 BIOS Unlock
Last Post: yousade
Today 08:23 AM
» Replies: 56
» Views: 25382
[REQUEST] Thinkpad T14S G3 AMD (Type 21C...
Last Post: Dudu2002
Today 04:37 AM
» Replies: 1
» Views: 74
[REQUEST] Lenovo B490 (H1ETxxWW) Whiteli...
Last Post: sardax
Yesterday 10:03 PM
» Replies: 101
» Views: 31861
[REQUEST] Acer Aspire E1-571(G) BIOS Unl...
Last Post: Dudu2002
Yesterday 04:44 PM
» Replies: 127
» Views: 58035
Acer Predator Helios 300 N17C1 G3-572-79...
Last Post: chadreuel
Yesterday 11:39 AM
» Replies: 0
» Views: 130
[REQUEST] Acer Nitro 5 AN515-56 BIOS Unl...
Last Post: Dudu2002
Yesterday 07:25 AM
» Replies: 5
» Views: 897
[REQUEST] Lenovo Y50-70 (9ECNxxWW) BIOS ...
Last Post: Dudu2002
Yesterday 03:52 AM
» Replies: 1972
» Views: 662162
[Request] Acer Aspire Z1620 (h61h aio v1...
Last Post: spingernexx
04-24-2024 06:09 PM
» Replies: 2
» Views: 177
[REQUEST] Lenovo G505 (82CNxxWW) Whiteli...
Last Post: khaos
04-24-2024 04:15 PM
» Replies: 155
» Views: 55380
Asus Prime b250m plus, RAM compatibility
Last Post: Slayery777
04-24-2024 06:23 AM
» Replies: 0
» Views: 160
[REQUEST] Bios Unlock Request Clevo W230...
Last Post: happycrazyman
04-23-2024 03:53 PM
» Replies: 0
» Views: 142
Rog Strix B650E-F BIOS File Extraction
Last Post: panmetrix24
04-23-2024 11:25 AM
» Replies: 0
» Views: 157
[REQUEST] Lenovo G50-70 (9ACNxxWW) White...
Last Post: Pipo89
04-23-2024 06:47 AM
» Replies: 236
» Views: 69850
[REQUEST] Acer Nitro 5 AN517-41 BIOS Unl...
Last Post: onetapxdf
04-23-2024 03:37 AM
» Replies: 11
» Views: 1380
[REQUEST] Lenovo G400S (7BCNxxWW) Whitel...
Last Post: Dudu2002
04-23-2024 03:14 AM
» Replies: 203
» Views: 70801
[REQUEST] Lenovo V570(c) (44CNxxWW) BIOS...
Last Post: d3m3n7r
04-22-2024 05:20 PM
» Replies: 18
» Views: 11203
[REQUEST] Lenovo Y520-15IKBN (4KCNxxWW) ...
Last Post: ati90
04-22-2024 05:02 AM
» Replies: 64
» Views: 37125
[REQUEST] Lenovo G580 (5ECNxxWW) Whiteli...
Last Post: SteamTug
04-22-2024 04:24 AM
» Replies: 1731
» Views: 546209

Lenovo Bios downgrade without TPM clear
#1
Hi,

I am trying to solve the problem with Lenovo Yoga 700 14isk BIOS update. It was accidentally flashed to a newest firmware but without Bitlocker suspending. After that, OS found BIOS version change and wants recovery keys instead of taking it from TPM module. Unfortunately a pendrive with restore keys was lost, so the only chance is to downgrade the BIOS. It's based on Phoenix.
I run the OS from external HDD and tried to downgrade it, but it shows warning that downgrade will cause TPM module clear. This notebook has Intel PTT enabled, so the decryption keys are wrote somewhere at Intel's chip.
The status of TPM module shows that it's owned by other system, so definitively it wasn't cleared.

   

I created bootable DOS usb, but I didn't try to flash it by DOS tool, because I am not sure which options should be marked.
I am attaching unpacked BIOS images (newest and previous) in CAP container with dedicated flash tools.

https://1drv.ms/f/s!AhSrYdRl4bnajUJl1KsXDmq_goKS

Bitlocker checks hardware changes during boot process. If I could recover the previous state it should let me in.
I think that Windows during booting with Bitlocker checks only Bios version or maybe checksum.
I spent a few days trying to find a solution, but I got nothing. So maybe someone from this forum could help me?
Any ideas how to flash it without TPM clear?

Thanks for help!
find
quote


Forum Jump:


Users browsing this thread: 1 Guest(s)