Problems with my car audio on C4 II ( MTCD_MX ) - MTCD Android Head Units Q&A

Hello guys , i got this Android GPS : http://www.ebay.fr/itm/Autoradio-GPS-android-6-1-Android-CITROEN-C4-et-DS4/322588577611?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
My car is a Citroen C4 II from 2011 and I have connect the canbus 2008 that is come in the box of the GPS .
I got problems using the steering wheels remote and with the A/C informations displayed on the the screen !
For the remote :
-the next and previous are reverse and I need to press the scroll wheel before the gps detect actions , when I scroll the wheel to the down it give me the next track and when I scroll to top it give the previous , with my original GPS it was top = next and down = previous ) .
- Nothing appears in the remote manager .
For the A/C informations :
- My A/C on the dashboard said for example 14°C but the screen display said it’s 16°C , the degrees are always increment by 2 points what is wrong ?
Here is a video that show you the 2 last problems :
https://www.youtube.com/watch?v=ye2hQSCw794
How can i fix that ? By updates ?
Here is pictures about my systems information :
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help ?

Today i have root my device and install Xposed if it can help for something !

Nobody for help ?

My radio for my c4 Citroen work with android 4.4 she don’t open

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Will Look into the links ! Thanks !
Hi ! thanks for your reply, with regards to timer, it is actually a java timer , i have implemented the same in my android studio app, but the maximum frequency iam able to achieve is 40hz( Os introduced delay is so high), that's why to increase my data rate to 500 hz , i rooted my phone and am trying ways to directly access Flashlight through kernel and use timer trigger and achieve my objective.
I will try my luck with the crantab feature that you had suggested

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