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Sir, when i started my system there was a message in DOS mode "bad bios checksum. starting BIOS recovery ........ checking floppy drive ....... checking CD_ROM...........

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The battery of the motherboard may gone weak, replace it with a new one.

Posted on Jan 03, 2009

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SOURCE: bad bios checksum

You need to go to the website of whoever made the motherboard and get the BIOS flash utility and the BIOS binary file to update your BIOS. Make sure you get the right one, as using the wrong one can render your motherboard worthless. The BIOS file has to be the exact match. There is no such thing as close in this situation.
If you are not sure of the exact make and model, get te free Belarc Advisor from http://www.belarc.com
The BIOS chip holds information about your motherboard hardware. It is reprogrammable. It uses what is known electrically erasable read only memory. This is also called Flash memory. Reprogramming is called flashing. When you flash the BIOS, all data is erased, then the new data is written. The flash utility will most likely allow you to save the old contents, but you might have an extremely tough time recovering from an improper flash. You'll also probably need a couple of floppy disks, one of which may have to be bootable. If you need a bootable floppy disk, you can get an image file from http://www.bootdisk.com.

Posted on Jan 23, 2009

6ya6ya
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Posted on Jan 02, 2017

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Bat bios checksum problems solve


Step 1:
Update ASUS BIOS b> Insert bootable floppy disk or USB drive. Copy the updated BIOS file to floppy disk or USB drive.
(Note: BIOS file and boot files should fit on a floppy disk. If the BIOS file is too large to fit with boot files, consider using the EZ Flash method described below.) Insert the motherboard support CD into optical drive. Copy AFUDOS.EXE from CD to a floppy disk or USB drive. Reboot. When the DOS prompt appears, type the following: afudos /i[name of BIOS file]For example, "p4c800b.rom" might be the name of the new BIOS file. "afudos
/ip4c800b.rom" is the command that will install it. Wait. Your monitor will display the update's progress with a series of messages: "Reading file," then "Erasing flash," then "Writing flash." The "writing flash" message will be followed with a percentage counter that tells you how far the write has proceeded. The final message will be
"Verifying flash." DO NOT switch off or reboot at any point in this process or you will ruin your motherboard. After the update is complete, the utility will return to the DOS prompt. Remove your floppy disk and reboot. Enter the BIOS Menu and load "Setup Default." Save and reboot. You're finished. b> Update Using EZ Flash Copy your new BIOS files to a floppy disk or USB drive. Reboot. When the system is at POST, press "Alt" + "F2" to enter EZ-Flash. Alternatively, on late model motherboards you may press "Delete" to enter BIOS setup, then access EZ-Flash from the "Tools" option on the navigation bar. (Select Tools > ASUS EZ Flash 2 > YES) Wait for your system to check current BIOS information. Insert your floppy or USB with the new BIOS file. Select the drive letter with the BIOS update file, then select the file. Wait for your system to check the update file. After the file check is finished, click "Yes" to update your BIOS. Wait. Let the update procedure run until it finishes. Do not switch off or reboot or you will ruin your motherboard. When the update is finished, remove the floppy or USB drive and reboot. Enter the BIOS Menu and load "Setup Default." Reboot. You're finished. b> Update Through the Internet If it isn't installed already, install the ASUS Update utility. You can either download it or use the copy on your motherboard's support CD. Close all Windows applications if any are running. Launch the ASUS Update utility from the Windows desktop by clicking "Start>Programs>ASUS>ASUSUpdate>ASUSUpdate." The "ASUS Update" main window will then appear. Select "Update BIOS" from the "Internet option" drop-down menu. Click "Next." Select the ASUS FTP site nearest you, or choose "Auto Select." Click "Next." From the FTP site, select the BIOS version that you wish to download. Click "Next." Start the update. Wait for it to complete.

http://support.asus.com/technicaldocuments/technicaldocuments.aspx?root=198&SLanguage=en-us

Feb 05, 2013 | ASUS Eee PC 900 Notebook

2 Answers

Asus motherboard bios recovery


Solution #4 posted on Aug 07, 2008 0%20stars_w.png
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Ekse
Rank:guru_s.gif Guru
Rating: 85%, 1169 votes
In the disk you burned, the bios can't read a zip file, the file needs to be extracted and as far as I remember you need to use a diskette instead of a cd. but I will look into it now.
Comment by Ekse, posted on Aug 07, 2008 Bios warning

Please note, BIOS update is only recommended when experiencing technical difficulties with your system, And is not recommended to be performed regularly.

Moreover, due to the nature of BIOS update, there is certain level of dangers involved. BIOS update must be performed with extreme caution . During BIOS update process, your system must be maintained without interference or power loss to prevent unexpected damage.

In case of BIOS update failure, please follow instructions in your User's Manual for guidelines on BIOS recovery via CrashFree BIOS. In the event that BIOS recovery is not recoverable via CrashFree BIOS, please contact your place of purchase for further assistance on BIOS recovery.


Source Asus
You can get the bios from here
http://support.asus.com/download/download.aspx?SLanguage=en-us&model=P4V8X-X

Get the 1008 version

its under Bios and 3rd entry, all os version 1008
File is in zip format, needs to be extracted.
the rom file inside needs to be placed in a diskette.
Comment by Ekse, posted on Aug 07, 2008 Diskette or if you can get the bios to read a cd then that is fine also. Comment by Ekse, posted on Aug 07, 2008 if the setup is looking for a file named as
P4V8X-X.rom

it may be required to rename the PV8XX08.rom to P4V8X-X.rom

But im not perfectly sure what you are trying todo or why it is asking for it. il have to look into this more. Comment by Ekse, posted on Aug 07, 2008 As I suspected, BestDarnGood linked us the manual and the correct page about the problem. it confirms that the file has to be renamed and placed in a floppy.

Thanks BDG
http://www.fixya.com/support/p362915-asus_p4v8x_x_motherboard/manual-11149/page-39

Aug 07, 2008 | Computers & Internet

1 Answer

How do you flash the BIOS


What happens when you turn the computer on?

If the bios is working enough to enable you to boot from a CD download the new bios from asus along with there AFUDOS.exe flash utility and make a bootable CD and copy both to it.

If the bios is completly none functional you should be getting this msg when you turn the computer on,
Boot Block Compatible Version Ver .010
Bad BIOS checksum. Starting BIOS Recovery
Checking for floppy . .
Floppy not found
Checking for CD rom . . .
CD not found
Checking for floppy . .
Floppy not found
Checking for CD rom . . .
CD not found

Repeat adinfinitum.
If this is the case you need download the most recent BIOS from compaq and either copy it to a bootable CD if you have this capability or buy a floppy drive for $5 and make a bootable floppy on a working computer and copy this BIOS file to it. Then rename the bios file to A8N32SLI.ROM.

You may not even need make the floppy bootable but I would just in case.

Stick the floppy in the drive turn the computer on and you will see

Boot Block Compatible Version Ver .010
Bad BIOS checksum. Starting BIOS Recovery
Checking for floppy . . .
Floppy found.
Reading file "A8N32SLI.ROM" . Completed.
Start Erasing...
Start programing . . ./
Please turn off your system and power on again to get system back.

and happy days will be here.

Jun 29, 2012 | Compaq Presario CQ61-310US Laptop

1 Answer

I try update my bio on my ao0751h netbook acer, and doesn't successfully, now my netbook doesn't turn on. How i recovery a bios?


Solution 1: Boot-block BIOS
Modern motherboards have a boot-block BIOS. This is small area of the BIOS that doesn't get overwritten when you flash a BIOS. The boot-block BIOS only has support for the floppy drive.If you have a PCI video card,you won't see anything on the screen because the boot-block BIOs only supports an ISA videocard.
Award: The boot-block BIOS will execute an AUTOEXEC.BAT file on a bootable diskette. Copy an Award flasher & the correct BIOS *.bin file on the floppy and execute it automaticly by putting awdflash *.bin in the AUTOEXEC.BAT file.
AMI: The AMI boot-block BIOS will look for a AMIBOOT.ROM file on a diskette. Copy and rename the correct BIOS file on the floppy and power up the PC. The floppy doesn't need to be bootable. You will see the PC read the floppy, after about 4 minutes you will hear 4 beeps, this means the transfer is done. Reboot the PC and modify the CMOS for your configuration.
Solution 2: Get a new BIOS chip
  1. Contact your motherboard manufacturer to see if they sell BIOS chips. Some motherboard manufactures send them for free.
  2. Contact a company that sells pre-flashed chips, like Unicore Software, FlashBIOS.ORG, BadFlash or Bios World
Solution 3: Hot-swapping
Note: I'm not responsible for any damage this method may do to you or your computer !
  1. Replace the corrupt chip by a working one. The best option is to take the working BIOS chip from a motherboard which has the same chipset although that's not absolutely necessary. It just has to give you a chance of booting into DOS. Before pulling the working BIOS chip out of it's original motherboard, set the System BIOS cacheable option in the BIOS to enabled.
  2. After you have put the working BIOS in the motherboard with the corrupt BIOS boot the system to DOS (with a floppy or HD).
  3. Now replace (while the computer is powered on) the working BIOS chip with the corrupt one.
  4. Flash an appropriate BIOS to the corrupt BIOS and reboot.

Solution 4: (for Intel motherboards)
  1. Change Flash Recovery jumper to the recovery mode position (not all products have this feature)
  2. Install the bootable upgrade diskette into drive A:
  3. Reboot the system
  4. Because of the small amount of code available in the non-erasable boot block area, no video is available to direct the procedure. The procedure can be monitored by listening to the speaker and looking at the floppy drive LED. When the system beeps and the floppy drive LED is lit, the system is copying the recovery code into the FLASH device. As soon as the drive LED goes off, the recovery is complete.
  5. Turn the system off
  6. Change the Flash Recovery jumper back to the default position
  7. Leave the upgrade floppy in drive A: and turn the system on
  8. Continue with the original upgrade

Feb 03, 2010 | Computers & Internet

1 Answer

Emachines notebook m5310 corrupted bios recovery


Solution 1: Boot-block BIOS
Modern motherboards have a boot-block BIOS. This is small area of the BIOS that doesn't get overwritten when you flash a BIOS. The boot-block BIOS only has support for the floppy drive. If you have a PCI video card you won't see anything on the screen because the boot-block BIOS only supports an ISA videocard.
Award: The boot-block BIOS will execute an AUTOEXEC.BAT file on a bootable diskette. Copy an Award flasher & the correct BIOS *.bin file on the floppy and execute it automaticly by putting awdflash *.bin in the AUTOEXEC.BAT file.
AMI: The AMI boot-block BIOS will look for a AMIBOOT.ROM file on a diskette. Copy and rename the correct BIOS file on the floppy and power up the PC. The floppy doesn't need to be bootable. You will see the PC read the floppy, after about 4 minutes you will hear 4 beeps, this means the transfer is done. Reboot the PC and modify the CMOS for your configuration.
Solution 2: Get a new BIOS chip
Contact your motherboard manufacturer to see if they sell BIOS chips. Some motherboard manufacturers send them for free.
Contact a company that sells pre-flashed chips, like Unicore Software, FlashBIOS.ORG, BadFlash or BiosWorld
Solution 3: Hot-swapping
Note: I'm not responsible for any damage this method may do to you or your computer !
Replace the corrupt chip by a working one. The best option is to take the working BIOS chip from a motherboard which has the same chipset although that's not absolutely necessary. It just has to give you a chance of booting into DOS. Before pulling the working BIOS chip out of it's original motherboard, set the System BIOS cacheable option in the BIOS to enabled.
After you have put the working BIOS in the motherboard with the corrupt BIOS boot the system to DOS (with a floppy or HD).
Now replace (while the computer is powered on) the working BIOS chip with the corrupt one.
Flash an appropriate BIOS to the corrupt BIOS and reboot.
Note: Use a flasher from MRBIOS. They are known to work best. You can find them at ftp://ftp.mrbios.com
Solution 4: (for Intel motherboards)
Change Flash Recovery jumper to the recovery mode position (not all products have this feature)
Install the bootable upgrade diskette into drive A:
Reboot the system
Because of the small amount of code available in the non-erasable boot block area, no video is available to direct the procedure. The procedure can be monitored by listening to the speaker and looking at the floppy drive LED. When the system beeps and the floppy drive LED is lit, the system is copying the recovery code into the FLASH device. As soon as the drive LED goes off, the recovery is complete.
Turn the system off
Change the Flash Recovery jumper back to the default position
Leave the upgrade floppy in drive A: and turn the system on
Continue with the original upgrade


Oct 14, 2009 | Computers & Internet

1 Answer

My computer can not boot -BIOS ROM checksum error


to be honest if you have tried to re-flash your bios, and it did not work you still either have hte wrong version or the disc drive your using to flash it from is faulty. try another floppy drive/disc and try again. if that dont work. to be honest it's not worth getting it repaired just go out and spend £30-40 on a new mobo. sorry i'm not more helpfull but i dont believe it's worth spending that much time and effort on an old system like that with this kind of problem. good luck to you. let me know how you get on ok.

Jun 15, 2009 | EliteGroup K7VTA3 V5.0 Motherboard

2 Answers

P4S800D.ROM not found


check the the bios battery, it should be 3volt not less,and press dell to in the bios page setup set and set everything you need to do.and don't forget to save it,. good luck

May 10, 2009 | ASUS P4S800D Motherboard

1 Answer

Checksum error


Hi Oliver, the most common error related to the message,
(Bios Rom Checksum Error). Someone has left a floppy disk in the floppy drive. Once the floppy disk has been removed press the reset button on the PC, your windows will start normally. Next place to look is in your bios.
Open your manual to page 27.
Enter your bios & go to the title Advanced BIOS Features. Check First, Second & Third boot devices they should be as follows. Floppy disk drive, CD-ROM drive & primary hard disk drive. If both of the above are ok than try clearing the cmos/bios by resetting the cmos jumper (JP1) location on page 5. Descriptions of page five on page 6. CMOS settings on page 9.
When your system restarts re-enter your cmos & reset up your bios settings. Lastly if none of the above has fixed the error message, than remove the cmos battery & check its voltage. It should maintain 3volts. If yours' is lower than 3volts replace the cmos battery. There is one other possible fix. It’s an option not given lightly. Flashing a cmos/bios is not recommended unless all other options have failed.
Bios link for the EliteGroup P4VMM2 V8.1
http://www.ecs.com.tw/ECSWebSite/Downloads/ProductsDetail_Download.aspx?detailid=436&DetailName=Bios&DetailDesc=P4VMM2%20%20(V8.1)&CategoryID=1&MenuID=82&LanID=0
Main web site;
http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?CategoryID=1&DetailID=436&DetailName=Feature&MenuID=52&LanID=0

Good luck Oliver!
Mike

Aug 23, 2008 | EliteGroup P4VMM2 V8.1 Motherboard

5 Answers

Bad BIOS checksum.... CMOS bad checksum errors


BOOT BLOCK COMPATIBLE VERSION VER .005
BAD BIOS CHECKSUM

CHECKING FOR CD ROM
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO CD-ROM FOUND
CHECKING FOR FLOPPY DISK
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
READING FILE "P5SD2VM.ROM"
NO FLOPPY DISK FOUND

Does someone already fix this problem??????

Nov 15, 2007 | ASUS M2N-MX Motherboard

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