As you may know, Samsung has a flash counter or binary counter in their newer devices, so they can tell if the user has flashed any unofficial ROM or kernel. This counter voids your warranty, if it’s higher than 0, though we can help you get rid of it, fortunately.
There are multiple ways of resetting the flash counter, though the easiest one is flashing a specific kernel which does a great job resetting it. The problem is many have bricked their devices using this kernel, though we suppose your device is still damaged if you want to recover the warranty.
So the solution is pretty easy: you have to flash this kernel and then a stock ROM, so that you will get the stock recovery back.
How to flash the ICS kernel and recover warranty and reset flash counter
Like I told you before, there’s a kernel that can restore your binary counter. But please note that it can permanently brick your device, so you are doing it on your sole responsability. I’ve used it a few times without doing anything to my device, but the risk is still high, as many reported that this kernel bricked their Galaxy Note N7000.
If you are sure you want to do it, then you will have to download the kernel here and Odin 1.85 here. Now make sure that your device is disconnected from your computer, turn it off and boot in download mode ( hold volume down, home, and power buttons simultaneously ). Now extract the downloaded kernel, open Odin and load the kernel as PDA. Connect your device to the computer and press start.
Once it finishes, reboot your device in download mode and check if your flash counter has been reset and the yellow triangle will also be gone.
If you still have ClockworkMod Recovery or another custom recovery, then you will have to proceed to the next step and install an official one.
How to flash a stock ROM
There are two ways of doing this: You can fully flash an official ROM, or begin flashing and pull out the battery when it reaches about 50%. I recommend the second method because it will look like a Kies update failed, which is not your fault.
So head over to SamMobile and download an official ROM for your Galaxy Note N7000. Then reboot in download mode again, open Odin, load the downloaded ROM as PDA, connect the device to your computer and press start. If you pull the battery when it reaches about 50%, your device will look like the official Kies update failed and the flash counter wll show 0. This should guarantee a device or motherboard replacement.