There are two main ways these devices update:
Method A: SD Card Update (Most Common) If your TC2 has a microSD card slot, this is the standard method. dsotc2 firmware upd
Method B: USB PC Connection If you do not have an SD slot, or if the update requires a PC tool: Screen Glitches After Update:
Choose the method supported by your device (web UI, USB, SSH/TFTP, vendor updater). Device Won't Turn On (Bricked):
USB-based update
TFTP / SSH / Command-line
Vendor desktop updater