> For the complete documentation index, see [llms.txt](https://doc.open-tx.org/manual-for-opentx-2-2/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.open-tx.org/manual-for-opentx-2-2/advanced-features/flashing_the_bootloader.md).

# Flashing the bootloader

From time to time it will be necessary to flash the bootloader with a newer version.

Copy the currently downloaded firmware (.bin file) into the FIRMWARE directory of the SD card.

Keep in mind that The total number of character in a filename is 32 including the extension file name. So max length is 28 and “.bin” = 4 (dot is considered 1 character).

First you have to jump into the [Radio Menu](https://github.com/opentx/manual-for-opentx-2-2/tree/f979370e594d8dd8ae71861cc48a0af0a7c8234e/advanced/radio_menus.md) then hit the page button until you get to the SD CARD menu.

Highlight the FIRMWARE directory and press the \[Ent] key.

Highlight the bin file and Long Press \[Ent].

Choose flash bootloader from the menu and press \[Ent].

You can verify the bootloader version by going into the VERSION page of the Radio Menu.