OptiPlex 755, BIOS update not working?

I suggest you try a12 or whatever is directly next.

I'm pretty sure this is a non-UEFI system, so you might need to do it like this:

https://dell.com/community/Vostro/Vostro-460-XPS-8300-Upgrade-Adventures/m-p/6071757/highlight/true#M1311

Ok, I will try and do this

will i need to install freedos if i am using rufus?

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the method that you sent me does not work unfortunately, are there any other things that i can do?

You must use MSDOS floppy or Install XP on a hard drive and run as administrator.

USB flash drive booting is not supported.

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@Trent123 wrote:

will i need to install freedos if i am using rufus?

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Yes, both Rufus and FreeDOS's full-installer are used. If you comprehend the directions, not sure why you asked that.

SOLVED!!

apparently bios update is cleared from memory during reset. it depends on memoty type and even the varies from slot to slot. In my case I had 2 x2gb memory sticks and 1 gb memory stick. Bios update only worked when only the 1gb stick was in and only in slot number 3!!!

I first updated to a19 and then to a22 but i am not sure that is necessary. After upgrade I reinstalled all memory sticks, 

if F12 update bios is missing, (me guessing 13 years ago yes? 2007 PC it is , in dog years.99 and is a dog, for sure.. core2, Q35 jive box.

then

run DDDP dell DOS

https://www.dell.com/support/article/us/en/04/sln143196/how-to-create-a-bootable-usb-flash-drive-using-dell-diagnostic-deployment-package-dddp?lang=en

for sure works ! and for  sure safe, 100% safe if using UPS AC on line.

Dell DOS run it , it works,  no need for rufus and silly freedos and lack of memory , EMM etc. pains. endless.

Dell DOS runs OOBE, for sure. works.

dell also says if you scramble the BIOS with bad burn, you will not get good F2 or F12 menus.

and you need to reflash to this

https://www.dell.com/support/article/us/en/04/sln143196/how-to-create-a-bootable-usb-flash-drive-using-dell-diagnostic-deployment-package-dddp?lang=en

one can only hope 2007 dell pC can even boot to USB, port. stick but is in the BIOS PAGES that, if present.

https://www.dell.com/community/Desktops-General-Read-Only/OptiPlex-755-refuses-access-to-boot-sequence-menu/td-p/3763575

dan that is so wrong. not told method my wild guess, using Freedos and fooled the EMM memory manager in freedos and fooled it in to working, why post lacking METHOD.

and is not solved you can;t tell the OP is problem is solved ok?

there are 5 ways if you read the dell pages, on upated bios.

1. F12 way safest
2. DDDP, dell DOS, (super safe)
3. then if wild and wolly use Freedos and not the one using full memory fail. freedos.org.
4. and windows burns, (crazy  IMO) but listed. (I never do this, not brain dead yet)

dell lists them as LINUX ways, but means NOT WIndows , in truth. means F12 or DDDP.

or worse yet reading posts here, im off a BestBUY , begging for Floppy diskettes  and getting  hard ugly looks from the employees and for worse from close by customers, (hey old dude you just crawl out of a cave he said)

F2 works see this video, and so does it have USBOOT same video. 39seconds in,  see USB controller

click F12, at time mark.1:10,  see F12 works and so will Dell dos boot.

@savvy2

mE  Wild guy cRAWL out of cave ...

Then use  DDDP, dell DOS, (super safe)

BoOt DDDP, USB, dell DOS, (super safe); It  give nasty message to wild cave dyude:

Error 4c00:0522  ?

Lost 1200 years bc.