Make sure that all the requirements are green.

Activate chrome://flags/#prompt-api-for-gemini-nano-multimodal-input
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Pending

Activate all the flags
FlagValue to select
chrome://flags/#optimization-guide-on-device-modelEnabled Bypass*
chrome://flags/#prompt-api-for-gemini-nano-multimodal-inputEnabled
chrome://flags/#optimization-guide-debug-logsEnabled
Verify that Gemini Nano has been downloaded
  1. Navigate to chrome://components
  2. Search for Optimization Guide On Device Model on the page.
  3. Click on Check for update
  4. Ensure that it says Up-to-date

It seems like the page is stuck

After you have clicked on for the first time, Chrome has to download Gemini Nano. This can take a while (5-10 minutes). While this is happening, the page can seem frozen or like nothing is happening. Give it time then try to restart your browser.

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Prompt