Here's why:
Do not run arbitrary unknown strings as commands. If you need to install a real package, use: dx80ce820syn213brelpkg install
What happens behind the scenes:
Click . Do not refresh the page or disconnect power until the "Success" message appears. Method B: Command Line (CLI/FTP) For headless systems, use a secure transfer protocol: Open your terminal or command prompt. Connect to the device via FTP/SFTP: ftp 192.168.1.1 . Navigate to the update directory: cd /update/fw . Upload the package: put DX80CE820SYN213BRELPKG . Here's why: Do not run arbitrary unknown strings
On the screen, the text changed one last time before the monitors went black: dx80ce820syn213brelpkg install
file dx80ce820syn213brelpkg