I'd be happy to help you with your requests!

From the provided text, I noticed that it contains information about SEO Checker, iOS firmware downloads, and a free SEOBacklinkCheckerTool download for Android devices.

Here are some potential tasks I can assist you with:

1. SEO Checker compatibility: You want to know which Umbraco versions and database types are compatible with SEO Checker. According to the text, SEO Checker is compatible with Umbraco version 7 (up to release 2.8) and up to 8.x (V2.8 and up), as well as SQL Server (Express), SQL CE 4, and Mysql databases.

2. iOS firmware downloads: You can download current and previous versions of iOS, iPadOS, macOS, watchOS, tvOS, and audioOS firmware from the provided text. The text also mentions receiving notifications when new firmwares are released.

3. SEOBacklinkCheckerTool download for Android: You can download the free SEOBacklinkCheckerTool 4.06 for your Android device from the provided text. The file size is 39.94 MB, and it requires Android version 5.0 (Key Lime) or higher.

Please let me know if you'd like to perform any of these tasks or if there's anything else I can assist you with!

For ios instal SEO Checker 7.4