Firmware update stuck at 0% (Same problem with a twist)

are you able to power down and observer the same stuck issue when power up again?  this looks worrisome.  I would power down, disconnect power cord, press power button to drain power, replace cmos battery and clear cmos settings if possible.  you see this screen would occur if you had run a bios update before.  It then restarts and try to flash but fails.  a failed flash can brick motherboard.  I would try to abort the flash process.  do not let it start on its own.  for whatever reason this pc is not good for bios flash.

Same problem here - Dell 7090 - stuck at 0%...

Tryed many times - using windows update / usb manual update / downloading directly from Dell webpage - every time result is the same.

Luckly - hard power off - disconecting power cord from unit, doesn't bick it... Computer is working, but unable to performe bios update

Similar issues have been resolved by removing all external USB devices and keeping only necessary peripherals while updating firmware. 

Have you try BIOS recovery method via USB and with OS drive removed?  If you want to give it a try, download this BIOS_IMG.rcv file to a FAT32 formatted USB stick and performing BIOS recovery with OS drive removed.

I had this same problem (frozen BIOS v1.15.0 update) today with an OptiPlex 5000 SFF. It was frozen in this state overnight. I left the power connected, but pulled all the other connections off the back of the machine. In my case this was 1 x Ethernet plus 2 x USBs plus 1 x DisplayPort cable.

Then I plugged the single DisplayPort cable back in to see if anything was happening. The BIOS update began to run and eventually finished and booted to the Windows 11 desktop.

Then I plugged the 3 remaining unplugged cables back in. It seems to be operating OK with the BIOS v1.15.0 update now thankfully completed.

Weird!

Neil Howard

worked for me.

tnx :)

I managed to solve it in the following way  

In this situation what you should do is disconnect all the cables necessary for activation. Then turn off the PC with the button until the light goes off, then disconnect the PC and reconnect it, when the fan starts spinning you will press the power button, this way you will have the pc updating 

Optiplex 7000 micro

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Logré solucionarlo de la siguiente manera En esta situación lo que debes hacer es desconectar todos los cables necesarios para la activación. Luego apaga la PC con el botón hasta que se apague la luz, luego desconecta la PC y vuelve a conectarla, cuando el ventilador comience a girar presionarás el botón de encendido, de esta manera tendrás la pc actualizando Optiplex 7000 micro.