I am having an almost similar situation. The timer counts down to 0 and I am stuck there. I also have a keyboard installed, however it will not enter the boot kernel or launch recovery. It actually doesn't let me do anything from this screen. I have tried 2 different keyboards. They are working as the CTRL ALT DELETE triggers a reboot. I know the the latest version of CWM was installed. Not really sure how to proceed.
Edit: Apparently I got it working now. Not exactly sure what was wrong but it's up and running. Yesterday when I was triggering the recovery at boot via the ALT PrntScreen i it didn't actually boot recovery, but somehow later it did? After doing that it allowed for movement on the boot menu, but at that point I just loaded 4.0 to remove boot menu. Then flashed boot menu again and everything was working.
I've done a few boxes for family and friends and never had this issue, glad it decided to fix itself one way or another.
I too have found myself in a similar situation. Currently trying to remedy the situation.
I've been following AFTVnew's wonderful rooting guide in conjunction with the Amazon FireTV Utility App for basic commands (like launching adb shell, pushing files, or rebooting the FTV.
This morning my AFTV sat with bootloader unlocked, CWM 6.0.5.1.4a, 51.1.4.0_514006420 updated, rooted, busybox installed, updates disabled, and all file checksum's verified before flashing.
Aftering continuing on with the AFTVnews rooting guide it was time to install the custom boot menu. I opted to manually input commands, instead of relying on the FireTV Utility App. After rebooting the AFTV the custom boot menu clock ticked down to 0 and just sat there - unable to select anything. I was able to press Ctrl-Alt-Delete to reboot, at which point I selected recovery, and now have access to adb shell again. The only thing I can think of which deviated from the guide is that I had initially transferred "firetv-bootmenu-1.0.img" to the sdcard before renaming it as the guide suggested. I then decided to rename it by doing "cp firetv-bootmenu-1.0.img bootmenu.img". I'm curious if there would be any
permission problems in doing so (I'm somewhat of a Linux novice)?
I'm wondering what the best course of action is. Do I reboot and hope for the best? Do I flash 51.1.4.0_514006420 updated to the AFTV again and flash that to start over? Or should I transfer 51.1.4.1_514013920 fixed instead? I'm currently in the process of transferring both to the SD Card. I assume 51.1.4.0 is the logical choice? What do you guys think?