Usually a Fujitsu ScanSnap document scanner after unstapling the manual and slitting the binding fold with a paper knife. Also scanner phone apps like Readdle S

Usually a Fujitsu ScanSnap document scanner after unstapling the manual and slitting the binding fold with a paper knife. Also scanner phone apps like Readdle Scanner Pro work very well for thick cardboard that won't feed through a scanner (I do have flatbeds but it's usually too much trouble to unpack them into my tiny home office).