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1) you CAN rESTORE The machine going to panel control and see restore to some date that was working good.Otherwise is download the BIOS from toshiba accordsing the version that you have. press key f1 , and Reinstall the new version BIOS.God bless you
For the BIOS password reset of your laptop, I wont recomment to dismantle your laptop on your own. My suggestion is to contact Toshiba to reset it. Mostly for the portable computer manufacturer had a tool to generate a generic password to bypass the bios password to reset it, if there's none have it serviced to depot or a technician.
The cmos battery in laptops is not easily replaced. The whole laptop must be taken apart to get at the cmos battery which is soldered to the motherboard. You should be able to find a new battery on ebay but then will require someone to take it all apart and resolder the new battery onto the motherboard
Toshiba used to charge $175 to reset that password at a service facility. There is a way to crack that password but Toshiba threatened to sue me and deleted my post from the Internet (also offered me a job, lol). You get a DB25 connector and by shorting together a certain combination of wires, then plugging it in to the printer connector on the laptop while it is off. When you turn it on again the BIOS setup screen appears and you clear the password.
I have that wiring diagram somewhere but you can google 'Toshiba dongle' to see if it is still poted elsewhere. Good luck, Steve
I can't find step by step instructions for dismantling your laptop (I found them for a Toshiba), but in general the CMOS battery on any PC is on the motherboard (this includes laptop motherboards). You'll have to take the system apart, including taking the keyboard out, etc. etc. to get to it.
Take a look at how a Toshiba 6100 is taken apart for an example:
It's not for the faint of heart so I'd recommend taking it to a local repair shop ...