Acer Aspire 7540G { Unlocked BIOS in post #13 }

[konie06]

Acer 7540 and 7540G has the same bios and same motherboard .
also , no overclocking options in the bios to unlock .

Hey I had a question, why arnt you able to add fan controls or overclocking options in the Bios?

[sh3ll]

Acer 7540 and 7540G has the same bios and same motherboard .
also , no overclocking options in the bios to unlock .

Splendid work! Had to use my first post for this. Thank you Mr. Hossam.

[Prof.A]

Ahmed Hossam,
All the tools and links are very good...., followed every step verbatim, and it worked with no issues or hiccup so far. Now I'm able to use Virtual Box or VMware... with virtualization enbaled.
Many Thanks Prof.A

System Info:

Amd Athlon II Dual-Core M300
4GB Ram
Windows 7 Home Premium
ATI Mobility Radeon HD 4200 Series

[xir98]

sadly black screen after flashing this.
Any help how to recover?

Acer Aspire 7540G

[Sml6397]

Hello xir98,

1.) Does your hard drive light illuminate as it normally would upon computer boot up? If so, #2 will likely solve your issue as this means that your BIOS is not bricked. If your hard drive light illuminates, but #2 does not solve your problem, then the BIOS can be normally flashed (with the original unmodified BIOS image) from DOS using the steps here. Be sure to follow the steps for Phoenix BIOSes. If #1 and #2 do not work, continue to #3.

2.) Try clearing the CMOS settings. There may be an incompatible setting set. To do this, remove the CMOS battery, laptop battery, and power adapter for 10 minutes. During these 10 minutes, hold the power button for at least 15 seconds to dissipate any remaining power.

3.) There is a BIOS recovery method for Phoenix BIOSes known as CRISIS. Please visit this page for instructions on how to use it.

[xir98]

sadly i have no hd light wenn i switch power on. Can hear the HD but no light
any idea, can i change the bios eprom, saw i can order a flashed one für 15€? where is the eprom on the mainboard?

[Sml6397]

Hello xir98,

Have you tried CRISIS BIOS recovery? You should try this before ordering the chip.

[xir98]

yes, tried it but the usb stick light don´t flash, so i guess it didn´t boot :/

[Sml6397]

Hello xir98,

I have created a list of possible CRISIS recovery key combinations on this page.

Try these and post your results. Make sure that all power sources are disconnected before you start pressing and holding each of the key combinations.

[xir98]

sadly CRISIS did not work.
Opened the laptop and removed the cmos batterie over night but it also did not change anything.

Any idee where the eprom chip is located?