I wasn't able to get the device working since. I tried installing latest versions of Gnabo ROM multiple times and even installing the official N8010 4.4.2 via Odin.
I can't flash another bootloader so I'm stuck with the leaked 4.4.2 one. I really need to get the tablet working again and I have no other ideas.
I installed the leaked 4.4.2 on my N8010, including the N8000 bootloader. It worked fine. I then installed a few versions of Gnabo ROM, it also worked fine. Then, I rebooted the device, and suddenly it was started to bootloop at the samsung logo (the one with the sound, after the GALAXY NOTE 10.1 boot screen). I then reinstalled the ROM, and once I rebooted again it was bootlooping again.