Odin3 Bootloader button is greyed out I'm trying to install the custom Rapture ROM to improve performance on my aging Note 4. I've rooted it and now in following the instructions I see I need to update my FW which involves loading BASEBAND.TAR.MD5 using Odin3. (quick link).

My problem is that even though I've downloaded the baseband and bootloader when I run Odin3 all of the buttons except for 'AP' are greyed out so I cannot proceed. Please advise.
In the case you weren't eager to look at the research, here's the solution.

In the same folder of your Odin executable, you'll find a file called Odin3.ini. Being it a configuration file, it defines the behaviour Odin should meet at startup. What we're interested into, though, is to examine its content, so fire up your text editor of choice and open the file.

Once opened, you'll see various sections, each marked by a [Something] label. What you need to do, is to find the [ButtonOption] label.

After you've found it, you'll see various entries under it. Specifically for your case, the section should be similar to the following:

[ButtonOption]
Bootloader=0
PDA=1
Phone=0
CSC=0
UMS/PATCH=0
USERDATA=0


Now, a 0 means that the corresponding checkbox is greyed out, while a 1 lets Odin know that such checkbox will be selectable. Since the flags' names can be confusing, here's a brief overview of their meaning:


Bootloader = BL button
PDA = AP button
Phone = CP button
CSC = CSC button
UMS/PATCH = UMS button
USERDATA = not implemented yet


You should now be able to edit the flags in order to activate the needed checkboxes. Just remember to save your changes afterwards.