[Nvidia Tegra Note 7] TerryRed:
4.3/4.4 crash. I fixed mine finally! 4.4 working great, no crashing!

I had the exact same problem as you... I finally got it working, up to date with 4.4 CWM recovery, rooted and sd card fix. All working great... but here's some history...

I had the same bootloader that never worked from Power on/Vol Up, but would work after an adb reboot into fastboot. (blank screen only)

I was on stock 4.2.2, then unlocked bootloader, then updated to 4.4 using Supertool 2.2, Root, Sd card fix, but stock recovery still. All installed fine, but I had the crashing problem. Factory reset, and reinstall.. didn't solve the problem.

So I went back to 4.2.2 using the "temp" cwm recovery (using the root option to get in the cwm recovery, but I flashed the 4.2.2 file from root junky web page instead of rooting)

So here I was at 4.2.2 stock (from rootjunky web site), and stock recovery. Still not bootloader screen from Power.Vol up.

4.3 OTA would not work (dead droid with red triangle,error),

So I used supertool 1.5, installed CWM recovery, then I installed 4.3. It worked and rooted automatically, but I still got the crashing, and no bootloader by Power/VolUP. 4.4 OTA wouldn't work even when I put stock recovery back.

Here's where I got it to work from 4.3 stock (with crashing still happening, blank bootloader):

So now I used Supertool 2.2 to flash its version of CWM recovery (I had to keep touching the screen to keep it from crashing until CWM was installed and rebooted).

I did NOT use Supertool 2.2 to flash 4.4 as it contains the OTA 2.1 with it!!! (We don't want that yet! You'll se why below) I copied the 4.4 file at rootjunky: "Stock-4.4.2-TegraNote7.zip, February 22nd 2014 460 MB" onto the internal sd card (NOT the external sd card)

I used adb commands to reboot tablet into cwm recovery (had to keep touching screen until it rebooted into recovery so it wouldn't crash). Then I flashed the above 4.4 file. Install went fine. Of course I I still had crashing with 4.4 stock again. However, I noticed that the OTA 2.1 update appeared! I tried to update, but of course it wouldn't with CWM installed. So I reflashed recovery back to stock using supertool 2.2

Guess what happened next? The OTA 2.1 downloaded, flashed and worked! This was the first time I was ever able to get ANY OTA update to work! The key was to flash a stock 4.4 that didn't contain the OTA 2.1, and have stock recovery (from supertool 2.2) first in order to allow the OTA 2.1 to install!

Guess what works now? 4.4 works with NO CRASHING! and my bootloader finally works by holding Vol Up and Power ON and fully function menus,etc..!!! The tablet runs beautiful! The 4.4 had no root, or sd card fix applied, and stock recovery, but it DID lock the bootloader!

So now I used supertool 2.2 to unlock the bootloader (which I could now do because my bootloader had working menus, and could be accessed by Power/Vol Up). Keep in mind that this does a factory reset and wipes user data. (I had not wiped ANY user data right from 4.3 up until now!)

After the bootloader unlock/factory reset, I then used supertool 2.2 to: install CWM recovery, install root, install sd card fix.

Now I have an EVGA Tegra Note 7 with a fully functional bootloader, 4.4 Kit Kat, CWM recovery, root, sd card fix. All running great with NO crashing!

This is what worked for me... proceed with caution and know what your are doing first. Good luck!