Re: Minor issues after legion Y540 was revived from a failed BIOS rollback



1) do you really have the same laptop and issue that I had (slow boot and no TPM)? If no then ask someone else for help.

2) try to manually update the ME firmware as this usually installs a non-initialized version. You can find the update from the driver update page for your machine.

3) If it does not work, then you will need to reprogram the chip using a hardware programmer. [B]I WILL NOT [/B] explain it in detail because there are too many steps (you will need...

Re: Minor issues after legion Y540 was revived from a failed BIOS rollback



I dumped the bios,
did this to the dump [url]https://winraid.level1techs.com/t/guide-clean-dumped-intel-engine-cs-me-cs-txe-regions-with-data-initialization/31277[/url]
and then flashed the bios back.Re: Minor issues after legion Y540 w...on/31277[/url]...

Re: Minor issues after legion Y540 was revived from a failed BIOS rollback

After taking some time to find suitable time to fix it (wanted to make sure I had the time and money in case I needed professional help) I managed to fix it!

Everything together with all the learning and dumping took me like 3.5 hours, but I managed to do it with only some very minor hiccups.

Big thanks to reformatt for the assistance in the thread and the ME analyzer exe tutorial and SMDFlea for the materials on cleaning the ME region!

Re: Minor issues after legion Y540 was revived from a failed BIOS rollback



Yeah, unfortunately it wasn't able to update (Error log contains Error 20: Cannot locate ME device. Error 620: Unknown hardware platform.) I just noticed that Intel MEI is not working in Device Manager also.

So I would assume that probably means that clearing the ME region will be have to be done according to the guide on Win-Raid and will involve a SPI flaser at some point....

Re: Minor issues after legion Y540 was revived from a failed BIOS rollback

Thanks for the answers!

A proper plan then probably would be to first correct the DMI info, which doesn't seem to be that daunting with the Lenovo tool.

Then updating the ME firmware.

And Lastly, if any problems persist, do a BIOS update in hopes that it flashes both the BIOS and EC and this correction fixes any lingering issues.
Though, given that last time a BIOS rollback failed, and knocked out my primary PC for two weeks, I am a bit wary about the whole process...

Hello,

The computer is a Lenovo y540 [URL="https://psref.lenovo.com/Detail/Legion/Lenovo_Legion_Y54015IRH?M=81SX00MSLT"]81SX00MSLT[/URL]
The computer had to have a BIOS chip reflash, which was done by a repair shop.
The computer works, but it has created a couple of minor issues.

1) The computer takes 12 seconds to POST while previously it wasn't more than 3-5.
2) I noticed that the TPM chip is not recognized, while I hadn't have planned on using TPM features or using software that requires one, I probably will want to at some point...

Re: New Members - please post your introductions here

Hello,

I am from Latvia. Have had experience doing very simple fixing up and maintenance (rewire headphones, replace mouse switches, re-pasting and cleaning out electronics). Did a semi-dumb thing and had to bring my laptop to specialist and thought to educate myself while my computer is in the shop.