UniverseThank you for your prompt reply.
I have already replaced the airbag cover, with multimedia buttons, and cruise / lim buttons.
In order to save money, I refit the right button (OK with arrows circuit board, M with mutimedia control shell ), replaced the SMD RESISTOR on the circuit board with the same value that on the cruise/lim controller , so now the left the button(ok with arrows)is used to control the trip computer settings or switch the displaying information , the right button (the appearance is M with next/previous/vol+/vol- , the circuit board has been changed ) is used to control cruising / lim speed driving, and so I need't to cut the steering wheel to install the cruise/lim controller.
About the odometer , I've bought a new basic odometer which has been installed the firmware F1ET-14C026-AAE, it's a 2012 focus English firmware, everything works ok, the firmware can support the cruise control, speed limiter, and view the mileage information, consumption information, tire pressure detection function...
Now I want to upgrade the firmware to a 2015 focus English firmware, model is F1ET-14C026-AAJ , I'v downloaded it from the site that you provided me , and I also download the other 3 maching documents: F1ET-14C318-AC, F1ET-14C026-AEG, CM5T-14C318-AD.
I'm a novice, only get a elm327 cable (ms-can enabled) , so I want to konw how to install the new firmware ( the 4 files above), and these 4 files form a complete firmware? No more files needed ? If the firm is competed , can I use the focccus 0.8.6 , switch to the "tools" table, use the "upload vbf" function to install the new firmware? or I must by a new els27 cable to replace my elm327 cable ?
My car current status: