NETWORK Adapter Wirles-lan Dell Latitude d830

Here is the sservice manual on how to open the laptop open and replace parts. Hope that is helpful.
http://ftp.dell.com/Manuals/all-products/esuprt_laptop/esuprt_latitude_laptop/latitude-d830_Service%20Manual_en-us.pdf

RUN the software diagnostic ONLINE from www. dell.com for determine what hardware is fauly.
Get the support too via ONLINE by chat or calling.
God bless you

Get a usb wifi adapter and see if that solves the problem for awhile and if it does it again replace the hard drive for the spot the drivers are on is bad and if that is the case the wifi will not connect for the drives are bad on the hard drive. best thing is to replace the harddrive and reinstall windows. hadrives are only good for about 2 years or less better to get a ssd for it is faster and will work longer some get up to 5 years.

The other suggestions were how to clear BIOS passwords... but your question was how to flash the bios.

If, indeed, you were asking how to flash the bios, navigate to http://www.dell.com/support/drivers/us/en/19/Product/latitude-d830 and download the BIOS executable. Run it like a standard application, and it will force a reboot, update the BIOS, then reboot again. When everything is completed, your BIOS will have been updated.

hi,

you can look this page, i think you should consider buy a new battery Dell Latitude D830 , mabe this is a very short moyen.

You can download the drivers from here.

Hope this helps

Ray

Try to uninstall and reinstall your Local Area Network driver by going to the device manager from the control panel. expand the network adapter and right-click your LAN then select uninstall. Restart your computer and windows will automatically reinstall your LAN driver.

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http://www.user-guides.co.uk/download/dell/delllatitude/dell-latitude-d830-recovery-partition.html

If you haven't got the recovery disk that your computer came with then this should help.

Kindly check in the "Device Manager" if there is an exclamation mark beside the Wireless network adapter. If yes, you need to update your wireless driver. If no, there could be a hardware problem on the wireless lan card.