can't boot from isos like clonezilla, gparted or systemrescure

To upgrade GRUB2 to version 2.12 using the Bookwork backports repository on a Debian Bookworm system, you would typically follow a process like this. Note that `Bookwork` refers to Debian Bookworm (testing). Here are the steps to follow:

### Step 1: Add the Bookworm Backports Repository
1. Open a terminal and edit your sources list:
   
   ```bash
   sudo nano /etc/apt/sources.list
   ```

2. Add the Bookworm backports repository to the list of sources. This will allow you to access newer versions of software than the ones provided by the stable branch. Add the following line to your `/etc/apt/sources.list`:

   ```plaintext
   deb http://deb.debian.org/debian bookworm-backports main
   ```

3. Save and close the file (`Ctrl + X`, then `Y`, and `Enter`).

### Step 2: Update Package Lists
Run the following command to update your package lists and include the new backports repository:

```bash
sudo apt update
```

### Step 3: Install GRUB2 from Backports
1. Install GRUB2 from the Bookworm backports repository:

   ```bash
   sudo apt -t bookworm-backports install grub2
   ```

   The `-t bookworm-backports` flag tells APT to pull the package specifically from the backports repository.

2. APT should now install the latest version of GRUB2 available in the backports repository (which, in this case, should be 2.12 if that's the latest). You may need to confirm the installation if prompted.

### Step 4: Verify the Installation
After installation, you can check the GRUB version to ensure that the upgrade was successful:

```bash
grub-install --version
```

This should show GRUB version 2.12 or whichever the latest available version is from backports.

### Step 5: Reconfigure GRUB
After upgrading, it's a good idea to update the GRUB configuration to ensure everything is set up correctly:

```bash
sudo update-grub
```

This will regenerate the GRUB configuration files to make sure the new version is fully integrated into your system.

### Step 6: Reboot
Finally, reboot your system to ensure the new version of GRUB2 is loaded:

```bash
sudo reboot
```

---

### Notes:
- Ensure your system is up to date by running `sudo apt upgrade` before beginning the installation.
- When using backports, you're getting packages that are newer than the stable version, but they might not be as thoroughly tested, so proceed with caution, especially in production environments.