The module allows converting the serial software M74.9 Niva, Granta, Vesta, Largus, Gazelle into a dual-mode version. It can be used for professional installation of LPG systems. It only works with a license for the M74.9 VAZ and/or M74.9 GAZ modules as follows: Having a M74.9 VAZ license allows working with VAZ firmware, but not with GAZ firmware. Having a M74.9 GAZ license allows working with GAZ firmware, but not with VAZ firmware. Having both licenses allows working with both VAZ and GAZ firmware. Module features: Supports switching between full calibration sets. Switching options: via DK2 channel, via accelerator pedal. (new!) Button with or without fixation. (new!) Protection against contact bounce and interference/noise at the switching input. (new!) Indication of the selected mode using the Check Engine lamp. (new!) Possibility to disable the fuel pump and injectors individually for each mode. Module characteristics: When creating a multi-mode firmware, the control program's checksum area remains unchanged. The created dual-mode firmware has protection against reading. ATTENTION! To provide additional protection against accidental modifications of data that may affect driving safety, the firmware is saved ONLY in the SMS-Soft Container File format, compatible with the CombiLoader bootloader.