Top: Twrp36090n8000imgtar

The N8000 uses old MLC NAND flash. Without TRIM, the tablet becomes unusably slow after 3 months. In TWRP terminal, you can manually force TRIM:

fstrim -v /data
fstrim -v /cache
fstrim -v /system

Use a hash checker (like certutil -hashfile on Windows or sha256sum on Linux). Correct SHA256 for the legitimate twrp-3.6.0_9-n8000.img.tar usually starts with: b5e9c... (Verify against XDA official post). twrp36090n8000imgtar top

If the file size is under 8MB or over 20MB, delete it immediately. The correct size is approximately 12.5 MB. The N8000 uses old MLC NAND flash