I'm so sorry! I think I've been an idiot. Correct me if I'm wrong, but the way to jailbreak, and then to install physkeyb is to put the install files in the root directory (say E
and then eject the Kindle and go to Menu>Settings>Update?
I've just realized that if the 5-way controller doesn't work, I can neither jailbreak or install physkeyb!
I tried putting the update_jailbreak_0.11.N_k3g_install.bin in the root and then resetting the Kindle, hoping that this would cause it to update itself with the jailbreak installer, but I got a message that the Kindle was unable to update itself.
I did the same thing with update_physkeyb_3.4.2-cs-sk_k3g_install.bin, but got another error message.
My only hope now is that I've misunderstood the procedure. If I haven't, I am sorry for having wasted your time. My apologies.