Yaelink android application development configuration tutorial

[emin]

Hi,

I am using Yaelink T58V and I want to develop application works on T58V. I had tried to enable developer mode on device but had no luck. I had found this document and it says I need to add custom.static.system_mode_selection=1 parameter to configuration file.

I believe my problem is that I can't change configuration of T58V.

I tried to export current config from Settings>Configuration from device settings (As in the screen shot below). Then add custom.static.system_mode_selection=1 param and import it. It doesn't work.


Then I implement a simple web server to send config file to T58V. Then add my server url to settings UI (As in the screen shot below). It doesn't work.



Here is the config file I was trying to send (or upload):developer-all.cfg


Is there a good tutorial for that changing configurations? I have been searching for all day but couldn't find any good document or tutorial for that purpose. Can you help with that?

Thanks.