I have a serious os problem, and tried using repair disc to repair them but no luck. So i decide to reinstall windows, but cannot access to bios setup due to forgotten password.
After three time tried i got a message System Disabled [02315]. Going to advance way, i decide to open-up my laptop and remove the cmos battery for a couple of days.
But there is no luck at all. It didn't manage to reset or remove the bios password.

Any advice would be much appreciated.

Thank you.

---

Added on January 2, 2011, 10:30 pmBy the way i've tried bypass or remove bios password using Backdoor bios password as shown below, but it's not works.

Phoenix Backdoor BIOS Passwords:

* BIOS
* CMOS
* phoenix
* PHOENIX


This post has been edited by JJY: Jan 2 2011, 10:30 PM

why dont u try put out the bios cap jumper?

As i know this laptop dun have cap jumper for BIOS reset

TS,ur BIOS info/password,etc located at EEprom chip.
The battery just working to save/setup for date n time only
no other way to reset d bios,u may ask pro technician to do it.

You might find these links useful:

Backdoor passwords
More BIOS Resetting Methods
CmosPwd - software that can apparently decrypt the password


This post has been edited by rlinux: Jan 4 2011, 02:24 PM

nice software CmosPwd
thank for sharing, i try test on my acer laptop

---

Added on January 4, 2011, 8:04 pmhalo it really work on my acer aspire 4740 new type

This post has been edited by meistsk: Jan 4 2011, 08:04 PM

You right dude, there is no jumper for Aspire 4741z i dunno the other brand.

---

Added on January 5, 2011, 7:13 amThe backdoor password don't work on Acer Aspire 4741z, dunno for the Acer model.
I'll try CmosPwd software

---

Added on January 5, 2011, 7:26 amI am thinking how to use the software since i don't have os in my laptop rite now.
Anyone got the idea?

This post has been edited by JJY: Jan 5 2011, 07:26 AM

Have you try boot from USB?

You mean for windows installation?
How to setup boot from USB if i cannot access into bios setting?
Thanks anyway.

This post has been edited by JJY: Jan 5 2011, 09:22 AM

Does your laptop have any removable BIOS battery?
If yes, unplug main power, remove the battery, hit the laptop power on button several times. Plug back the BIOS battery and main power. This should reset your BIOS to default settings without password.

Bro/Sis ltwvince, i've removed the cmos battery for acouple of days, but the password is still there.
But i'll try yours. By the way, do i have to attach the laptop battery when i hits the laptop power button?
Thanks anyway.

---

Added on January 6, 2011, 12:48 amI just try it, seems like it doesn't work for me.
Oh... Gosh


This post has been edited by JJY: Jan 6 2011, 12:48 AM