Developer Tools

Only on JetKVM. JetKVM Mini has no SSH or shell.

JetKVM is open to tinkering. SSH into the device, flash your own firmware, or read its serial console while it boots.

Developer Mode

Developer Mode turns on SSH access. JetKVM only accepts key-based logins, so you need an SSH key; your JetKVM password doesn't work over SSH.

Developer Mode weakens security. Turn it off when you're done.

Create and copy an SSH key

Open the Start menu, type PowerShell and open Windows PowerShell.
Create a key:
Terminal
```
$ ssh-keygen -t ed25519
```
Press Enter to save it in C:\Users\your-name\.ssh. If it asks to overwrite, type n: you already have a key, so skip to the last step.
Type a passphrase and press Enter, then type it again. Nothing shows as you type. To skip the passphrase, press Enter twice.
Copy your public key to the clipboard:
Terminal
```
$ Get-Content ~\.ssh\id_ed25519.pub | Set-Clipboard
```
It's the .pub file. Never share the one without .pub; that's your private key.

Press Command-Space, type Terminal and press Return.
Create a key:
Terminal
```
$ ssh-keygen -t ed25519
```
Press Enter to save it in ~/.ssh. If it asks to overwrite, type n: you already have a key, so skip to the last step.
Type a passphrase and press Enter, then type it again. Nothing shows as you type. To skip the passphrase, press Enter twice.
Copy your public key to the clipboard:
Terminal
```
$ pbcopy < ~/.ssh/id_ed25519.pub
```
It's the .pub file. Never share the one without .pub; that's your private key.

Open a terminal.
Create a key:
Terminal
```
$ ssh-keygen -t ed25519
```
Press Enter to save it in ~/.ssh. If it asks to overwrite, type n: you already have a key, so skip to the last step.
Type a passphrase and press Enter, then type it again. Nothing shows as you type. To skip the passphrase, press Enter twice.
Print your public key, then select and copy the whole line, starting with ssh-ed25519:
Terminal
```
$ cat ~/.ssh/id_ed25519.pub
```
It's the .pub file. Never share the one without .pub; that's your private key.

Add the key to JetKVM

In the JetKVM web interface, open Settings and then Advanced.
Check Developer Mode.
Paste the key into SSH Public Key and click Update SSH Key.

Connect

In the same terminal, run this with your JetKVM's IP address, shown on its front display:
Terminal
```
$ ssh root@<jetkvm-ip-address>
```
The first time, SSH asks if you trust the device. Type yes and press Enter.
If you set a passphrase, enter it when asked.

You're in a lightweight Linux system: BusyBox provides the shell and tools, and Dropbear the SSH server.

DFU mode

DFU (Device Firmware Update) mode flashes firmware over USB, without booting the installed system. Use it to test your own builds or to recover a device that won't start.

To flash your own build, follow DFU recovery and select your .img in place of the recovery image:

DFU recovery

Serial Console

The serial console shows boot messages, system logs and other low-level output. Use it to debug the boot process or test new features.

JetKVM carries its serial console over the SBU pins of its USB-C port. To read it, plug a USB-C SBU serial adapter such as USB-Cereal between JetKVM and your computer, set it to 3.3 V, and open its serial port at 115200 baud. If nothing appears, flip the adapter's plug.