Manuals:

K4-K5 User Manual (EN) v1.5

K4-K5 User Manual (DE) v1.5

K4-K5 Physis EXpansion User Manual (EN) v1.4

K4-K5 Physis EXpansion User Manual (DE) v1.4

Operating System Update:

O.S. Current Release: 1.2.4

K SERIES update guide (EN)

K SERIES Version History (EN) (1.2.4).pdf

K SERIES Firmware Version 1.2.4