N100 BIOS downgrade (USB voltage problems and charger battery)

Hello. (Sorry for my English). I have problem with my laptop lenovo n100 3000. I must downgrade my bios to 1.08 version, because I've problem with USB - when i click some button on my keyboard e.g. my pendrive was disconnect. Can someone say to me what I must do to downgrade? (Windows XP SP2)
I've download v1.08, install, but when the program flash my new version of bios my laptop has BSOD for 1 seconds..
Regards
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What was original version of Windows on the laptop?
Vista or XP? (Look for Windows sticker on bottom)
To determine current bios version, enter bios setup
on boot at Lenovo screen. (Press F1 key)
Look for bios version.
Newest XP version is 2.06
Newest Vista version is 1.08
Bios files and instructions (read them!) are on
THIS web page.
Try to boot in Safe Mode to install bios update.
(Press F8 key repeatedly at Lenovo screen to display
Windows boot option menu. Choose Safe Mode.)

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Cannot reproduce presumed fixed

N100 BIOS downgrade (USB voltage problems and charger battery)

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