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[UNLOCKED] Unlocking amd-v for Aspire AO725
07-18-2012, 09:24 PM (This post was last modified: 01-25-2013 10:42 PM by aricart.)
Post: #1
[UNLOCKED] Unlocking amd-v for Aspire AO725
Can someone pleasehelp me with acer aspire one 725 bios that have amd-v menu, so amd-v can be enabled... I realy need that fuction working for doing my research... I aleardy search anywhere but I dont found how to enabled the amd-v...
thank you before for any help.....
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07-19-2012, 02:14 AM
Post: #2
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
can some one please help???
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07-19-2012, 10:01 PM
Post: #3
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
any help please??
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12-18-2012, 11:39 AM
Post: #4
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
Ok, so I got amd-v working but I think i broke everything else. Acer now has a new bios for UEFI/Windows 8 (no upgrade). While the new bios has UEFI enbabled it doesn't turn off amd-v or any other extentions. This part is currently working on my laptop.
It isn't for upgrade and the bundled flasher doesn't allow upgrades from previous version. Flashrom (flashrom.org) let me overwrite the old bios with the new one zeroing out my old bios, SLIC, serial number, and mac address. The only deal breaker for myself is the mac address that has to be set at boottime from software. While I have a backup I could use to piece together with the update to put everything back, I haven't gotten that far. More importantly, it works for me so I'm less interested in a better solution.
The new bios however only enables amd-v while in UEFI mode, so I've had to repartition and have installed grub. It boots Linux just fine from systemrescuecd.org, didn't used my distro's packaged bootloader and just copied grub from the cd after it booted.
Anyway, this looks like my last purchace from Acer, so good luck everyone.
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12-23-2012, 05:41 PM
Post: #5
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
I have wrote to Insyde for investigating on the missing options in this BIOS. Insyde's techincal support have tells that each manufaturer customize the BIOS and I must to contact Acer.

I have wrote to the Acer support (the Italian support, because i'm italian) to take some information about the missing options in this BIOS. Acer tells me who the BIOS actually doesn't support AMD-V and if there will be new firmware there will be available on the Acer website.

I think it is important to reach a number of request. Also you must send a message to Acer for ask this feature. (I remember who Sony enabled the VT feature only after a consistent number of requests.)

now, some technical details

I have bought an Aspire One 725 with Windows 8 (AMD C-70), shipped with a 2.x version of the BIOS. I don't know if my machine it's able to boot with an 1.x version.

differently to stonefoz I have experienced that the AMD-V is disabled in both (UEFI/Legacy) boot modes. I have tested this feature on Linux.

I came from a self-made work (maybe, others has already reached my result)

I have downloaded the 2 bios available on acer website

v2.04 http://global-download.acer.com/GDFiles/...SC=EMEA_17

v1.05 http://global-download.acer.com/GDFiles/...SC=EMEA_17


I have found in the second archive (v1.05) the BIOS file named ZHGBIOS.FD

this file is named also in the technical service manual http://www.manualowl.com/m/Acer%20Comput...ual/288275

Then I look it with an hexeditor, this file start with the sequence

78 16 00 00 2E

and has a lenght of 4194304 bytes (0x400000)

The last BIOS (v2.04) is not in the SFX archive, it's attached (without compression) in the executable. I found the same sequence (781600002E) at the position 0x1656FD of the ZHG204.EXE file.

The extracted file started and ended with the same bytes contained in ZHGBIOS.FD but they are equal only for the 46% of the content (I have compared the 2 files with a binary diff)

At this point I am unable to disassemble the BIOS, to locate the variables.

I have thought to try with a dump of the memory (on Linux) for extract more times the BIOS with some variables changed (and the locate the the variables area, with a comparation) but I don't find a Live distribution of Linux with /dev/mem unlocked

hints and tips are welcome
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12-24-2012, 08:25 AM
Post: #6
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
I haven't seen any AMD-V stuff in there, but you can try this, should give you some more menus and options. Report back and post some pics.


Attached File(s)
.zip  Acer Aspire A0725 - BIOS 2.04 'unlocked'.zip (Size: 3.51 MB / Downloads: 572)

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12-24-2012, 06:38 PM (This post was last modified: 12-24-2012 07:43 PM by AlexKidd.)
Post: #7
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
uh, It's Christmas! :-) thanks!

I am tempted to try but there are some kind of "unclear"....

The zhgbios.fd included in your archive is 4,4 MB instead of 4 MB (dimension of a normal BIOS) and seems to be an executable (there is a magic number who start with same bytes of a DOS executables)

And a curiosity.... what tool have used to customize this BIOS? I'm unable to open the (original) BIOS with last's EzH20 public version available

edit:
(12-24-2012 08:25 AM)svl7 Wrote:  I haven't seen any AMD-V stuff in there

maybe it is called "svm support" have you seen this during the mod? (see the image)

This image it's not take from my machine, it's take on the web
http://srikrishnadas.files.wordpress.com...8-1847.jpg

2nd edit:

maybe "SVM support" should be located under "Power -> Advanced CPU Control"
I have seen the analysis performed here http://www.bios-mods.com/forum/Thread-te...5#pid36025
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12-24-2012, 11:14 PM
Post: #8
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
Yes, there is a SVM support entry in there.
And the BIOS file has the proper size. It includes a flashing tool since it's a bios which comes with "secure firmware updating" procedures...
I didn't think about this. You won't be able to flash it the usual way, I bet it will come up with an error when you try to flash it due to the messed up signature.

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12-25-2012, 02:37 PM
Post: #9
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
I'm confused, need some explanation. I wish to known what tool and techniques has used to mod my BIOS.

if I attempt an extraction (from your zhgbios.fd) of the firsts 4MB of the block who begins with the byte sequence "78 16 00 00 2E", the resulted binary block, that is looks like the BIOS 1.05, is usable to perform a BIOS upgrade in a normal way?
Otherwise, I am able to use this "binary block" (or your signed bios) to perform an upgrade of the bios with the FN+ESC trick? I think this upgrading technique doesn't involve any "secure firmware updating" systems. Should be a dirty upgrade from the first fd file found on USB flash drive.

If you know previous work on this problem, please tell me how to do a correct upgrade.
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12-26-2012, 10:33 AM
Post: #10
RE: [Urgent Request] Unlocking amd-v for Aspire AO725
Did you already try to just flash it the usual way?
If it doesn't work you could possibly still do it per FN+ESC, but I'm not sure, don't have such a system myself.
Else I can try some more things.

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