F5 BIP IP froze/hangs in EUD

The memory test on an EUD can easily take hours. I would suggest that you connect to the console and run the EUD from there, as it will give you a bit more feedback. You can also omit the memory test. You may not wish to do that, depending on why you are running the EUD.

The 4000 has 16GB of RAM, so it will almost certainly take more than an hour (probably several).

As the filesystem is not mounted during the EUD, you should be able to pull the plug, but I would not recommend it.

You can read about connecting via console here https://support.f5.com/csp/article/K7683

Your BigIP should have come with the relevant console cable.