How To Downgrade Dell Mini 9 BIOS to A00 From A04 or A05

I recently purchased an 8 cell 77 watt-hour battery from China via ebay for use with my Dell Inspiron Mini 9. This is up from the stock 4 cell 32 whr battery that it came with. I like the new battery so far, it about doubles the weight and size of my Mini, makes the mini look like it is on a stand, or plugged into a docking station — which actually improves ventilation. As a result, the screen doesn’t open up quite as much as it used to, but it hasn’t bugged me yet.

The ebay post said “only works with Dell Mini Bios Verson A00”. Wow they weren’t kidding. I have A04 (was planning on the A05 upgrade at some point), and upon insertion of the battery, it looked to charge and was fully functional, but the LEDs were going crazy! Flashing red and white, they really wanted you to know that this battery is not supported. The flashing was annoying enough; if there was no other issue with this battery I would have still wanted to downgrade to get it working right.

So I was able to locate on the mydellmini forums a utility that someone (somms?) put together called flashBIOS. This app has the capability of creating bootable media (I used a usb thumb drive) with a dos BIOS flashing utility. It even comes with all of the Dell Mini 9 (and even the Dell A90) firmware versions out to date. This is a sweet app, had to archive it.

Download flashBIOSv1.51.exe

It really is self explanatory. Start up the app, follow instructions and flash. I was down to A00 in less than 10 minutes after downloading this.


  1. gravatar

    James Said,

    August 22, 2009 @ 3:25 pm

    I also brought that long life battery and also have the crazy white & orange light flashing alternatively problem. Are you fix this problem after downgrade to bios version A00, if yes, want you tell me where I can download the version A00 dos flash file?

  2. gravatar

    Raybdbomb Said,

    August 22, 2009 @ 4:35 pm

    Looks like my link I posted doesn’t work anymore. I’d scan the MyDellMini Dell Mini 9 Hardware and Upgrade forums for it.

  3. gravatar

    BIOS Upgrade in Mac OS-X (Mini 9) - Page 2 Said,

    September 5, 2009 @ 3:03 pm

    […] if they help you with your downgrade- Dell I910 Mini/Vostro A90 USB Key Drive flashBIOS Utility Teh Blarg How To Downgrade Dell Mini 9 BIOS to A00 From A04 or A05 Dell Mini 9 | OS X 10.5.8 | DellEFI 1.2a5 | BIOS Version 5 | 32 GB SuperTalent | 2 Gigs […]

  4. gravatar

    Minihack Said,

    April 27, 2010 @ 10:53 am

    Thanks for this. Just downgraded BIOS for exactly the same reason. Easy peasy using the utility you supplied and so far under OSX 10.6.3 I see no down side except an incorrect reporting of battery time left……

  5. gravatar

    Rory Said,

    September 19, 2010 @ 2:30 am

    I seem to have the opposite problem as I have a00 bios and large battery will not recognise or charge and is flashing the lights. tried to upgrade to a04 but failed due to bios not flashable apparently. I have not tried a usb bios flash just windows.

  6. gravatar

    Blinking red/white light, battery issues - Page 2 Said,

    September 30, 2010 @ 8:20 am

    […] my mini with the battery out. Then I tried flashing my bios a million different ways, until i found this, which is from mydellmini. I flashed mini a05 by accident, which didn't fix the issues, and then I […]

  7. gravatar

    Julia Said,

    October 10, 2010 @ 12:36 am


    My Vostro A90 worked for about 11 months then the flashing lights started and it told me it didnt recognise the battery – which is the Dell original.

    Being an IT Pleb I bought a non descript battery thinking the battery had died or something as it wont charge up hoping this would solve the problem but it hasnt

    I contacted Dell as the mini was 2 days over guarentee but they told me no go!

    This looks like it could be the answer to my problems but as I said im a no hoper when it coems to IT

    So do i simply download the flashbios onto a usb memory stick?

    The plug the stick into the mini before I power it up?

    Then what do i do ?

    Sorry — can someone provide me with idiot proof step bt step instructions PLEASE

    Jules xxx

  8. gravatar

    Julia Said,

    October 10, 2010 @ 12:39 am

    ps I forgot to add it worked fine before i ran updates and the bios went to 4 ( whatever that means!)

    Ive tried to downgrade after reading something about bios being the problem on the dell forums using the Pheonix link on the dell updates website but it just keeps saying cant flash drive


  9. gravatar

    8 Cells "77Wh" Battery is Here! - Page 34 Said,

    October 19, 2010 @ 9:04 am

    […] […]

  10. gravatar

    Battery won't charge with A00/A03/A04/A05 Said,

    January 31, 2011 @ 2:30 pm

    […] […]

  11. gravatar

    Brett Said,

    July 26, 2011 @ 3:43 pm

    Thank you so much for hosting the flashBIOSv1.51.exe file, I couldn’t find it anywhere else.


  12. gravatar

    Mike Said,

    September 17, 2011 @ 12:58 pm

    Another thank you for hosting the file! Been looking everywhere for it!

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