Allen & Heath manuals have a few different names.
Broadly speaking, we release a hardware specific "Getting Started Guide" and product Line specific "Firmware Reference Guide" that covers the common software used between those products.
To find the Firmware Reference Guide click the "Products" dropdown at the top of the website, followed by the product range such as "dLive" or "SQ"
Then click "Documents"
Here you will find all the product range common documents, including the Firmware Reference Guide
Quick Links: dLive - Avantis - SQ - QU
To find the Getting Started Guide you will need to navigate to the specific model such as the "S3000" or "QU16" and select the "Documents" tab. Here you need to look for the Getting Started Guide