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Member
formydocs
Posts: 2

BIOS update/reset

I have an L305-S5885 Laptop and suspect that I have somehow managed to get a Virus in my BIOS (which I did not suspect till recently), and in course of my journey to fix my laptop after 2 hack attempts, managed to corrupt my BIOS (partition table corrupt or something like that is the message). When I try to install XP Pro on it, the part of the process where I get to choose the Drive to load the software on shows "Unknown Disk" and if I hit the 'Enter' key, I get a blue screen. If I try to load either Vista or Win 7, I am able to complete the process and once I am logged in as a User, I can see the Hard Drive as "C:".  I love my laptop and need to have XP Pro on it because many Applications that I use do not work very well with Vista or with Win 7.

 

(1) I tried to find the location of the CMOS battery but am unable to.

(2) How do I clean by BIOS / reset it to Factory Settings?

(3) Will a BIOS update (I'm at 1.50) be a complete wipe of the old BIOS or, is it possible that the Virus (if any) may still  continue to lurk, hidden in the BIOS?

(4) How do I verify if there exists a Virus?

(5) How can I fix the partition table corruption?

(6) What are my options?

 

Appreciate your help very much.

 

MR

Ace Advisor
Jerry_Lippey
Posts: 40,690

Re: BIOS update/reset

 

Satellite L305-S5885 (PSLB0U-07L02D)

 


the part of the process where I get to choose the Drive to load the software on shows "Unknown Disk" and if I hit the 'Enter' key, I get a blue screen.

This has nothing to do with your BIOS. (A virus cannot reach it in any case.) And it has nothing to do with your partition table.

 

It's expected to get a blue screen with a STOP 0x0000007B from Windows XP's installation package when the drive is Serial ATA. XP's Setup does not contain the driver for the SATA-drive's controller. Best to merge it into the installation package using nLite. Lots of places to find out how to do that.

 

If you're successful with that part, I expect you'll be back here looking for drivers.

-Jerry
Member
formydocs
Posts: 2

Re: BIOS update/reset - location of the CMOS battery - Toshiba Satellite L305-S5885

[ Edited ]

Jerry,

 

Thanks for your response, after trying several courses of actions like updating the drivers for the HDD, updating the BIOS, replacing the HDD with a new one, could not resolve the issue of “Unknown Disk”. Finally, over two weekends, managed to take the laptop apart - 1st weekend, reached the top of the Motherboard looking for the CMOS Battery with no luck. Just now, reached the bottom of the Motherboard and located the CMOS Battery - it is a “Maxwell ML12%0 Battery with Terminals,” and is soldered onto the underside of the Motherboard (“%” because the terminal is welded over the number and I am unable to see the number) – searched the Maxwell site, and found one which looks exactly like the one here (ML1220) - unsure whether this is actually the one. Not knowing that the terminals are welded and come with the battery, tried to pry the battery off the terminals till I noticed the 4 point-welds on the terminals! So, the CMOS Battery for the Toshiba Satellite L305-S5885 is on the underside of the Motherboard and is soldered onto it. Theres is not an easy way to reach it, and not an easy task to reset the BIOS by removing the battery! Will probably desolder the battery, order a new one, and solder the new one to the Motherboard – unsure of how it will end. Will keep you posted. Thanks again! Am unable to upload a picture of the location of the battery since this site accepts only '.txt' attachments. Would you know the battery model or an equivalent brand and model I can use?

 

MR

 

Ace Advisor
Jerry_Lippey
Posts: 40,690

Re: BIOS update/reset - location of the CMOS battery - Toshiba Satellite L305-S5885

Sorry, I can't help with the hardware. (I'm a Windows specialist.) Perhaps somebody better will jump in.

-Jerry