> For the complete documentation index, see [llms.txt](https://tk233.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tk233.gitbook.io/notes/stm32/misc/telesky-st-link-v2-upgrade-firmware.md).

# Telesky ST-Link V2 Upgrade Firmware

When prompt that device fails to enter DFU mode:

Eject ST-Link

<figure><img src="https://1287130752-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvVJ0h2a4qMIhB1I8GdV8%2Fuploads%2Fgit-blob-8d2e748fab38dd40886b8dce03e1bd7900eecf95%2Fimage.png?alt=media" alt=""><figcaption></figcaption></figure>

Unplug the device, leave the ST-Link upgrade window open

Re-plug the device

Click the "Open in update mode" button again

<figure><img src="https://1287130752-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvVJ0h2a4qMIhB1I8GdV8%2Fuploads%2Fgit-blob-f66a9f56da5233eddf69542c85bb4ae0456fce28%2Fimage.png?alt=media" alt=""><figcaption></figcaption></figure>