[Galaxy Note II Q&A, Help & Troubleshooting] vladeco:
I had the exact same problems you described in this thread and here with my own phone less than a month ago, and I was only able to fix it after one whole weekend trying. I had the multiple force closings of apps, TWRP couldn't mount /data or any other partition (although it could backup my EFS, which I did just in case -- I already had a backup lol). Because of that I could not factory reset. My problem though got worse after I installed a stock rom + PIT: it just wouldn't boot. It would stay forever on the Samsung Galaxy Note II GT-N7100 bootloader screen.

Now I'm going to describe what I did to fix it but I cannot guarantee it'll work for anyone OR that anyone should try it. My phone is currently working perfectly again (I restored a recent TWRP backup after I got it working again and it's been great ever since).

You're going to need:

Stock rom for your country (warranty reasons, just in case)

ODIN (I have and use v3.07)

HEIMDALL (v1.4.0 - get it here)

PIT file (I attached to the post the PIT for the 16GB Note)

Factory Bootloader (files attached to the post)

Also,

BE SURE TO HAVE A BACKUP OF YOUR EFS

, as always, just in case! I didn't need it to restore, but you never know. If you don't have a backup, DO NOT PROCEED!

ATTENTION: The attached PIT file is for the 16GB version of the Galaxy Note. If yours is the 32GB variant, you should use the appropriate file.

Part one: restoring Android

Boot your phone into download mode and plug it into your PC.

Open ODIN, and check Re-Partition, Nand Erase All, Auto Reboot and F. Reset Time.

Uncheck all other boxes

. Click the PIT button and select the PIT file appropriate for your device (16GB or 32GB). Click the PDA file and choose the Stock Rom you downloaded. Press start and wait.

If everything goes well, the process should succeed and the phone should reboot. Don't wait for the phone to boot into android. Immediatly boot into recovery, factory reset the phone and wipe cache. Reboot to Android.

Now, if everything worked well, your phone should boot into Android.

Check to see if your IMEI is intact (it was in my phone). If it isn't, don't worry! You have a backup of your EFS, right? RIGHT?!?

My Note booted fine, but every time I let the screen go off, it wouldn't wake up. I'd have to force reboot or remove the battery to make it boot again.

Part two: fixing the sleep of death

Extract HEIMDALL to a folder in your pc.

Boot your phone in download mode, plug it into your PC and follow HEIMDALL's readme to install its custom driver. If Heimdall doesn't open, check the link inside the Readme to download Microsoft's Visual C++ files.

Unpack the bootloader files in the ZIP attached to this post. Rename the BOOTLOADER_N7100_user_low_ship.tar.md5 to TAR only and extract the PARAM.bin file.

After you have installed the custom driver, open Heimdall-frontend go to the Utilities tab and click the DETECT button. The log should say your phone was detected correctly. Now go to the FLASH tab and choose the same PIT file you used when flashing with odin before. No need to check Repartition. Now click the ADD button and select on the left combo box the PARAM option. Now click the browse button below and select the PARAM.BIN file extracted above. No need to flash the trust zone file (tz.img) or the bootloader, since they were already flashed earlier with ODIN (also, this version of the bootloader is probably older than the one you have on your phone, so it'll fail if you try).

Click start and wait - it should only take a few seconds and then the phone should reboot. Wait for it to boot into android and see if the sleep of death issue is fixed -- it was for me (if you ever had them!)

Restore your EFS if you need to.

After all that, proceeded to root again, put TWRP back and restore my backups. My phone has been great ever since.

Please let me know if this helps you at all.

Cheers!