[Request]. Advanced menu in X220 without 5-5 Beep Problem (RSA checksums and so on).

[Simpetus]

I am sorry for cross-post.

Hi there,


What I need:

1. Unblocked advanced menu in X220 BIOS;
1. Unlocked memory speed 1866 on the systems with active TPM (get rid of "5-5 beeps and delay" problem on start-up without deactivating of TPM itself);

2. SLIC 2.1;
3. No White-list.

I understand it is an uneasy task and to make it possible you need to have some inside info about how TPM operates in Lenovo's X220 and how RSA checksum calculation goes.

XFD
There is RSA signature and SHA-1 checksums block at: 0x740048, RSA public key is located at 0x740A48. Make a HEX diff of modded and original BIOS. If RSA signature or any SHA-1 checksum is invalid and Security chip is enabled you will hear 2x5 beeps bursts on power on.

Here how it looks like:






I have SPI programmer and full dump of the BIOS, so I think it is safe to do different experiments.

Thanks in advance.

[Simpetus]

Anyone, please?

[LosSantosPro]

Hi,

It will be pretty much impossible to bypass RSA encryption, the only way would be to disable the TPM chip. You only need that chip if you pay monthly for an anti-theft protection, which has its downsides - ie system detects an abnormality which thinks the laptop is stolen, ive seen people having to replace motherboards because of TPM.

But I'd be happy to unlock advanced tab, remove WL and add SLIC 2.1

[gpspl]

Hi,

It will be pretty much impossible to bypass RSA encryption, the only way would be to disable the TPM chip. You only need that chip if you pay monthly for an anti-theft protection, which has its downsides - ie system detects an abnormality which thinks the laptop is stolen, ive seen people having to replace motherboards because of TPM.

But I'd be happy to unlock advanced tab, remove WL and add SLIC 2.1

I will be happy if you will unlock advenced tab and remove wl :>

[JumboJet]

Hi,

It will be pretty much impossible to bypass RSA encryption, the only way would be to disable the TPM chip. You only need that chip if you pay monthly for an anti-theft protection, which has its downsides - ie system detects an abnormality which thinks the laptop is stolen, ive seen people having to replace motherboards because of TPM.

But I'd be happy to unlock advanced tab, remove WL and add SLIC 2.1

Hi LosSantosPro,

Following on this thread, my HP ProBook 450 G2 laptop is in a similar situation regarding the TPM chip. The laptop can not go beyond the black bios screen as shown in the thread  I have posted in the General Forum:

https://www.bios-mods.com/forum/Thread-H...ocked-BIOS

Would you please offer advice on the way forward either in a PM or in the above thread.

I tried the basic method of removing the CMOS battery, never worked. Tried a usb bootable bios flash drive, the laptop fan just runs at high revs but nothing happens on screen.

Thanks in advance.

JumboJet