After BIOS Update cannot boot Satellite C640 using USB Stick

After upgrading my Toshiba Satellite C640-10E (PSC02E) bios to 2.00 WIN, I cannot boot the laptop using USB Stick, When I checked the BIOS using F2 I was stunned because the USB connected to laptop was labeled as FLOPPY drive. Is there any option to downgrade the BIOS?
Thanks

From my experience the BIOS is able to boot from
- USB FDD (floppy disk)
- Primary HDD,
- USB Memory stick
- Network (LAN)
So I dont think that your USB memory is recognized as a USB FDD but the USB FDD appears as a separate boot device.
It would be interesting to know if another USB flash memory would act as your old USB flash stick.
PS: as Tonny suggested: you cannot downgrade because you dont have previous BIOS version only Toshiba service agents are able to downgrade the BIOS using traditional BIOS.

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    see help 8....
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    Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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