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I'm on Chrome 147 too and disabled:

"optimization-guide-on-device-model"

- Enables optimization guide on device

"prompt-api-for-gemini-nano"

- Prompt API for Gemini Nano

- Prompt API for Gemini Nano with Multimodal Input

and deleted weights.bin and the 2025.x folder in "OptGuideOnDeviceModel"

Will report if Chrome 148 downloads the model again.

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If you touch those files into existence and chown to root and chmod to 0, it shouldn’t be able to ever overwrite them right?
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I'm on my phone now so I can't check if something has changed, but what you want to protect from change is the directory, not the files. A file can be deleted and created again if the process can write the directory.
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yeah, should work. Will try readonly on windows too.

Now I can't see it anymore, but shouldn't the model be under chrome://on-device-internals/ -> model-status?

Maybe you can uninstall there too.

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thanks, went to flags in Vivaldi and just in case disabled all flags containing "gemini" and first five results for "model"
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Those flags will exist already, but will default to enabled in 148.

That other flag is for using a different open-source inference engine to the (from what I can tell) closed-source one that's used by default.

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