
Samsung Galaxy Note
The latest firmware for Samsung Galaxy Note (GT-N7000) is N7000ZSLR1 with Android 4.1.2 (Jelly Bean), released on July 30, 2013 for 2 regions (CSC). Every official firmware build for GT-N7000, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/N7000ZSLR1
GT-N7000 started on Android 2 and has received 1 major Android upgrade; it now runs Android 4.1.2 (Jelly Bean). The newest build, N7000ZSLR1, was released on July 30, 2013. No new build has appeared for 161 months, so regular updates for this model have most likely ended.
Box codes of GT-N7000 for different colors and markets. Firmware is chosen by the model code GT-N7000 and your region (CSC), not by the SKU.

GT-N7000B

GT-N5105

GT-N8020

GT-N8013

GT-N8005
The newest firmware for GT-N7000 runs Android 4.1.2 (Jelly Bean): build N7000ZSLR1, released on July 30, 2013.
The latest build for GT-N7000, N7000ZSLR1, was released on July 30, 2013 (13 years ago).
GT-N7000 has had no new firmware for 161 months, so regular updates have most likely ended.
Yes, all firmware files for GT-N7000 are 100% official, original, and obtained directly from Samsung servers.
To flash GT-N7000, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing GT-N7000.