In some cases your phone might have some issues downloading the extensions, in those cases you can try installing them yourselves directly from the source.
When installing your first extension and are prompted that your phone isn't allowed to install unknown apps from that source, simply follow the prompt to allow it.
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<h4>Android 8.0 and higher</h4>
<p>In newer versions of Android you need to enable "Install unknown apps" by a per-app basis.</p>
If you need more help regarding this, read [this](https://www.theandroidsoul.com/how-to-allow-apps-installation-from-unknown-sources-on-android-9-pie/)
Extensions for **Tachiyomi** are technically installed the same as normal apps. Either you uninstall them through the app section on your phones settings or you go can do it in the app.
To uninstall an extension from within **Tachiyomi**, go to **[<MaterialIcon icon-name="extension"/> Extensions](/help/guides/extensions)** then tap **Uninstall** on the extension you want to remove.
### Why don't I have extensions or any sources in the catalogue?
- **Tachiyomi** no longer have pre-installed extensions, this means that you will need to install extensions you want to use from the **[<MaterialIcon icon-name="extension"/> Extensions](/help/guides/extensions)** menu.
- If you're getting the `Loader not implemented` error after clicking on a manga, you will need to reinstall the extensions you used to use. Which number in the menu corresponds to which is below.
### Why can't I find manga when searching catalogues?
It might be because the title is worded differently. Follow any of the steps below:
- Look up the title on a search engine like **Google** or a manga tracking service such as [AniList](https://anilist.co/home).
- See which site has the series, often a single site will not satisfy all your needs.
- Download the extension for that source from **[<MaterialIcon icon-name="extension"/> Extensions](/help/guides/extensions)** if it exists, read [this](/help/faq/extensions/#which-sources-are-there-in-the-multi-source-extensions) for a list of which extensions contains what sources.
- Go to **[<MaterialIcon icon-name="explore"/> Catalogues](/help/guides/catalogues)** → **[Browse](/help/guides/catalogues/#browse)** on a source then search for the manga again.
It means that the respective extension for the manga is not installed. To fix, install the extension for the manga. If it still doesn't work, uninstall then reinstall the extension again.
If you're not getting any results when searching MangaDex then you need to log in. To do so enter the **WebView** for **MangaDex** then press the **Manga** drop-down and choose either **Sign up** or **Log in** to proceed with the log in.
To enter the **WebView** go to **[<MaterialIcon icon-name="explore"/> Catalogues](/help/guides/catalogues)** → **[Browse](/help/guides/catalogues/#browse)**/**[Latest](/help/guides/catalogues/#latest)** next to **MangaDex**, open any manga from the list and then press the **<MaterialIconicon-name="more_vert"/> Overflow menu** in the top-right corner and then press **Open in web view**.
**MangaDex** allows you to search using the ID number to find manga. The easiest way to get the ID is opening the manga in your browser and looking at the URL.
- Chapters will no longer be updated once **MangaRock** is dead.
- There is no native way to automatically import your favorites from MangaRock, but you can try [waicool20/mr2tachiyomi](https://github.com/waicool20/mr2tachiyomi).
- Popular alternatives are **MangaDex**, **MangaSee** and **Mangakakalot**.
There is a tool to migrate from **MangaRock** to **Tachiyomi** courtesy of a member of our [Discord server](https://discord.gg/tachiyomi) by the same name as the creator, but a computer is required to finish the migration successfully.
Chapter cache can be cleared by going to **[<MaterialIcon icon-name="settings"/> Settings](/help/guides/settings)** → **[<MaterialIcon icon-name="code"/> Advanced](/help/guides/advanced)** then pressing [Clear chapter cache](/help/guides/advanced/#clear-chapter-cache).
::: aside
Read more about clearing chapter cache [here](/help/guides/advanced/#clear-chapter-cache)
If you get this error then you need to solve the **CAPTCHA** on their website using your browser (*Google Chrome*, *Samsung Browser*, *Firefox*, *Opera*, etc.).