Board definitions are available for the Atmega328p, STM32, and OrangeRX modules. The board definitions make it easier to compile and install the multiprotocol module firmware.
2. Go to **File -> Preferences**, or press Ctrl+Comma
3. Locate the **Aditional Boards Manager URLs** field and paste in this URL: `https://raw.githubusercontent.com/pascallanger/DIY-Multiprotocol-TX-Module/master/BootLoaders/package_multi_4in1_board_index.json`
**Note:** Multiple URLs are comma-separated.
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4. Click **OK** to save the change
5. Click **Tools -> Board -> Boards Manager**
6. Type **multi** into the search box to see the Multi 4-in-1 boards
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7. Click on the board you require and click the **Install** button. Repeat for both boards, if required. If you are installing the STM32 board for the first time, and you have not installed any STM32 or SAMD boards before (such as Arduino Due or Zero) the dependency toolchain will also be downloaded and installed.
7. Click **Close** to close the Boards Manager
## Verify the boards are installed
1. Click **Tools -> Board**
2. Scroll down the list to the **Multi 4-in-1** board headings verify that the boards you installed are available:
