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KK2.1(HC) & KK2.1.5. Instruction Manual. V1.18S1 Pro Issue 1. This document details the settings available in the KK2.1.X V1.18S1Pro firmware by Steveis. KK2.1++ All-in-One R5 firmware by RC911. Features (Revision 5). ===================== This custom firmware is based on the original KK2.0 1V6 firmware by There come. are a number of appS available for download, controller Hobby King KK2.1 and KK2.1.5 (64kB flash) Some more technical than others (check theKK2.1 & KK2.1.5. Instruction Manual. V1.16S1 Pro I ssue 1. This document details the settings available in the KK2.1.X V1.16S1Pro firmware by Steveis.