GT-N8000 stuck on Kies error screen

I got this Galaxy Note 10.1 a few years ago. Last year I decided to flash Gnabo Rom v7 on to my GT-N8000. The Rom was working for almost a year, until, when I tried to boot my device, it showed the cvm custom recovery thing.
So I just rebooted the device from the cvm, and it showed the Samsung logo animation. However, it was stuck on the animation for over a couple of hours, so now I can't use my device.
A few days ago, I tried some youtube tutorials on how to unbrick/unroot my galaxy note 10.1.
First I tried putting it in download mode and flashing a factory firmware(samsung) using odin 3, v1.85. I click on PDA and opened my rom. I clicked start. (I didn't touch anything except for PDA.)
The Progress was successful until the system.img part. It got stuck for a couple of minutes on system.img and then failed. I tried doing it again and using different usb ports but it still failed st system.img.
After that, I tried clicking on Bootloader instead of PDA, but it still failed on the system part.
Now my tablet shows the "Firmware Upgrade encountered an issue. Please select Kies in recovery mode & try again."
I could get into download mode but not recovery mode. (nothing happens when I hold power button)
Any help would be great. Thanks!!!

SAMSUNG GALAXY NOTE GT-N8000 stuck on samsung logo screen

I have SAMSUNG GALAXY NOTE GT-N8000 and it is stucked in SAMSUNG LOGO screen
1) Volume up + Power button - when i use these buttons a message comes "A custom OS can cause............" and whether i press OK or CANCEL it reboots and again stucks on the same thing

2) Volume down + Power button - when i use these buttons it reboots again and again untill i unhold that buttons

I think i cannot get in recovery menu

Please suggest me what to do ?