Ah, I see. That complicates things somewhat, but it's not impossible.

Without an internet connection, you won't be able to install `jmtpfs` (if it's not already installed) and mounting your Android phone's filesystem on your Debian machine could be challenging.

Here's an alternative method using Android Debug Bridge (ADB). ADB is a versatile tool that lets you manage the state of an Android-powered device. One of its functions is the ability to transfer files between a computer and an Android device.

**Before you start, make sure ADB is installed on your Debian machine.** If it's not, you'll need to find a way to install it first, which could involve temporarily connecting your machine to the internet or obtaining a copy of the ADB package from another machine.

**1. Enable USB Debugging on your Android phone:**

This is typically found in the "Developer Options" menu on your phone. If you don't see this menu, you'll need to go to "About phone" and tap "Build number" 7 times to enable it.

**2. Connect your Android phone to your Debian machine:**

Plug in your phone and set it to "File Transfer" or "MTP" mode.

**3. Verify that ADB detects your device:**

In your terminal, type:

```bash
adb devices
```

This should show a list of connected devices. If you see your device, you're good to go.

**4. Transfer the .iso file to your Debian machine:**

Use the `adb pull` command to copy the file from your phone to your machine. You'll need to know the exact path of the file on your phone.

```bash
adb pull /path_to_your_iso_file_on_your_phone/debian-kde.iso ~/
```

This will copy the file to your home directory.

**5. Create a bootable USB stick:**

Now that you have the .iso file on your Debian machine, you can use the `dd` command to create a bootable USB stick. Please see the previous instructions.

**6. Boot from the USB and install Debian KDE:**

Reboot your machine and boot from the USB stick, then follow the on-screen instructions to install Debian KDE. Please see the previous instructions.

Again, remember to back up any important data before you begin, as these operations can potentially delete your data if something goes wrong. Be especially careful with the `dd` command and make sure you're writing to the correct drive.