Lenovo 1-14ast-05

[mgrharry]

Trying to fix a Lenovo 1-14ast-05 which had a BIOS update interrupted and now powers on with flashing power button and solid caps lock light.

Downloaded the BIOS update file from Lenovo here:
https://download.lenovo.com/consumer...s/cwcn23ww.exe

Then I followed the steps here on how to extract the CAP file using UNIEXTRACT
https://www.badcaps.net/forum/showth...light=tdk+bios

Although the directions mention needing to extract twice to get the cap file, but UNIEXTRACT extracted WinFlash and CAP file in one go. I then edited the CAP file in HxD to extract what I thought was the correct 8192KB file and saved it.

Using CH341A programmer the standard software doesn't appear to support this BIOS model 25U6473F so I downloaded AsProgrammer 1.4.1 from here:
https://github.com/nofeletru/UsbAsp-flash/releases/

Read and dumped the BIOS chip with AsProgrammer (attached to this post as Original-BIOS-dump.zip). Then erased chip and flashed the BIN created earlier in HxD (attached here as Extracted-BIOS.zip) but system still won't post.

Did I miss a step somewhere?

Thanks.

[Vesko356]

Re: Lenovo 1-14ast-05

Using CH341A programmer the standard software doesn't appear to support this BIOS model 25U6473F so I downloaded AsProgrammer 1.4.1

>

I strongly advise you to use AsProgrammer_2.0.0a14, NeoProgrammer V2.2.0.8, or Colibri.

I then edited the CAP file in HxD to extract what I thought was the correct 8192KB file and saved it.

>

You didn't edited .cap file as it should.

[SMDFlea]

Re: Lenovo 1-14ast-05

Did I miss a step somewhere?

Thanks.

Yes you did it wrong but you was on the right track.Delete the first part 0-317 (length 318), then go back over to your backup,scroll all the way to the bottom and use your cursor to select the last line 90 90 E9 FB F4 00 00 00 FE 00 00 00 00 00 F2 FF .Select copy,or right click copy ,then switch back to CWCN23WW ,search for Hex-Values and paste in the hex you just copied (which is the last line of the bios) .Now just put your curser in between the last two FF`s .Right click and select-block ,the end offset will be set to 81FFFF ,enter 0 as the start-offset and click ok.
Copy and save into a new file,notice that that the selected length is 820,000 ,thats 20,000 too long, so whats going on ? .The clue is at the top of the file,if you look at the right hand side column you`ll see "Insyde Software" in plain text.This update includes the EC as well as the bios.Set the offsets from 0-1FFFF or 0 and the length to 20000 (20000 in hex is 128KB) ,CUT and paste into a new file ,leaving you with a new 8MB bios and 128KB ec.

Now you need to copy your DMI using the offsets:

DMI 321000 - 3213FF
w key 370000 - 3700BF

[Vesko356]

Re: Lenovo 1-14ast-05

Yes you did it wrong but you was on the right track.Delete the first part 0-317 (length 318), then go back over to your backup,scroll all the way to the bottom and use your cursor to select the last line 90 90 E9 FB F4 00 00 00 FE 00 00 00 00 00 F2 FF .Select copy,or right click copy ,then switch back to CWCN23WW ,search for Hex-Values and paste in the hex you just copied (which is the last line of the bios) .Now just put your curser in between the last two FF`s .Right click and select-block ,the end offset will be set to 81FFFF ,enter 0 as the start-offset and click ok.
Copy and save into a new file,notice that that the selected length is 820,000 ,thats 20,000 too long, so whats going on ? .The clue is at the top of the file,if you look at the right hand side column you`ll see "Insyde Software" in plain text.This update includes the EC as well as the bios.Set the offsets from 0-1FFFF or 0 and the length to 20000 (20000 in hex is 128KB) ,CUT and paste into a new file ,leaving you with a new 8MB bios and 128KB ec.

Now you need to copy your DMI using the offsets:

DMI 321000 - 3213FF
w key 370000 - 3700BF

If you followed it ok and made a new bios you can check its SHA-1 hash using Hxd. Analysis -> Checksums -> SHA-1 -> OK

4FFD7B417FF1F401E52801F314B5D1BDD69C52F3 * .If its the same hash youve done a good job.
.

* SHA1 edited to match current topic

[Vesko356]

Re: Lenovo 1-14ast-05

@Mgrharry - also notice there's a little catch in this exercise (regarding the SHA-1 result) about the Win key block, see the red symbols at the attached image:

[Vesko356]

Re: Lenovo 1-14ast-05

Yes you did it wrong but you was on the right track.

[bembo91]

Re: Lenovo 1-14ast-05

Hi, I'm looking for the schematics of this notebook... does anyone have them?

[Vesko356]

Re: Lenovo 1-14ast-05

Hi, I'm looking for the schematics of this notebook... does anyone have them?

This is not the schematic requests forum, its for bios requests ONLY!

Reminder: rules and organization of this section
https://www.badcaps.net/forum/showthread.php?t=117483

.

[Bowayne]

Hello, please assist with bootloop issue, on and off no bios screen, it shows fast some words once then bootloop.
Here is my dumb
Also I tried the above bioses, not working...powerbutton on off on off

[peste]

Hello, please assist with bootloop issue, on and off no bios screen, it shows fast some words once then bootloop.
Here is my dumb
Also I tried the above bioses, not working...powerbutton on off on off

read...https://www.badcaps.net/forum/troubl...before-posting