How do I upgrade the unRAID software?
In general, every unRAID release announcement contains the instructions for upgrading the unRAID software. See the Release Notes page. The Release Time Line section contains links to all of the release announcements. The instructions are explained in more detail here, for upgrading from v4.2 and later. Only 2 files need to be copied (bzroot, bzimage). For the upgrade to v4.4.2, there are 3 files (bzroot, bzimage, memtest) to copy. For another description of this upgrade, with good tips, see this. For a similar description, upgrading from v4.4.2 to v4.5-beta6, see this. For upgrading from any v4.0 or v4.1 release, there are 5 files to be copied. See this typical release announcement. For instructions on upgrading from v3 releases, please see the How To: Upgrading from unRAID version 3. For even earlier versions, please see the Pre-3.0 Upgrade Instructions. For instructions on customizing the unRAID Boot Menu (adding previous versions to its multi-boot choices), please see this post, beg