I tried to add NVME to my Asus z87-Deluxes 2103 Bios for my Samsung M.2 SSD SM951 and from the guides on this forum say it seems ready to flash.
Then the whole night i tried to flash the modded bios, but either my UFB doesn't work or i'm doing something wrong. I read about other tools like the Intel Flashing tool, but i can't seem to find it nor the other windows flashtool. I also tried to remove the capsule body, but that also didn't work.

I can't find anymore info on what i'm doing wrong.

Any ideas?

So i did this more than a few times, also tried the MMTool renamer(which just added a "mod_" to the name) AND the one provided by Asus/which renamed it to "Z87D.CAP):

Zitat

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a) Using the ASUS "USB Flashback" procedure
Many ASUS mainboards with an Intel 7- 8- or 9-Series chipset do support this very easy to use feature to get a modded BIOS flashed. These boards have a special "Flashback USB port" and a special "USB Flashback button". For details please look into your mainboard manual or at >this< ASUS site (maybe the Smart Redirect Addon has to be disabled).
Procedure:
Rename the modded BIOS file according to ASUS "USB BIOS Flashback Rules". The ASUS support is offering a tool named "BIOS Renamer for USB BIOS Flashback" for all mainboards, which support the USB Flashback feature. Furthermore the UBU tool offfers the renaming procedure as well.
Copy the modded and renamed BIOS file onto a FAT32 formatted empty USB Flash drive and insert it into the special "USB Flashback port".
Shut down the computer, but don't power it off.
Hit the USB BIOS Flashback button. A LED light will start blinking. Press the button for some seconds (LED light should have blinked 3-4 times).
Wait until the LED light doesn't blink anymore. This means, that the BIOS has been successfully flashed into the BIOS chip of the mainboard.
Then all is done. You can power off the computer and remove the USB Flash drive.

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Same thing every time: UFB LED blinks a few times and then just lights up. It doesn't do anything even after a few minutes. My USB stick has a led and it doesn't blink(just when i i press the UFB button for the 3 seconds).

well like i said i renamed it both via the Mmtool AND the asus tool(meaning it'now called (Z87D.CAP).
The USB is a FAT32 formatted 64gb USB3(which only shows 32gb!?)

i don't see how it could be USB3 as the problems cause? The port is usb3 itself.
Tried another USB3 stick. The UFB Led nlinked 3-4 times then stopped and stayed on while the USB stick was blinking.

So i tried it with two other USB2 sticks(4 sticks in total). Nothing. The Problem persists. The led blinks a few times and then stays solid.
I guess this means that the file must be damaged, right?

So i solved the problem!
I used the wrong MMTool. I was under the impression that newer ist better and used the MMTool from the UBU Bios Pack. I retried with the version 4.5x from the Asus guide and it worked. I used an old 2gb USB2 and the Asus z87-Deluxe 2004 Bios with the NVMEe addon from the Asus guide for this try. I did a Bios reset to defaults before flashing and it immediatley worked and my Board recognized the SM951-NVMe! I write this Update on my new Win10 Installation. 2200mb read and 13000 write speed! Saved my a couple Euros! Thanks to the Team!