Sorry to hear about your continued telemetry issues @iyad @onurbaskin !
Can you please snap a picture and/or send a link of the telemetry modules you are having problems with? Unfortunately, not all telemetry modules are alike. In the “How to Build a Drone” course we really recommend using the ReadyToSky telemetry modules, because I have personally tested many of these units without issue. Some of the other telemetry products are very buggy and difficult to set up (many will have driver issues).
Also, upgrading the ArduCopter version should not affect any telemetry issue you are dealing with. Additionally, upgrading the firmware to a specific version is a manual process that cannot be done with the sudo apt-get commands.
TLDR: My #1 suggestion would be to get those readytosky 915 modules if you aren’t using those already.
In your latest picture it looks like your 915 modules aren’t the ReadyToSky modules- are the ReadyToSky modules something you’d have access to in Turkey? Were your original telemetry modules the ReadyToSky modules?
Thanks for your updates on both of your guys’ drone progress I love the tenacity and plowing through issues! Believe me, I know how frustrating those issues can be.