Cannot access php files from android

I made app that access php files on this server.
It worked normally and it stopped working before few days,on android versions lower than 5.0.
I have searched a bit and some people suggested that it might be something wtih TLS protocol (lower android version can access only lower version of TLS ( TLSv1.1))
So have you guys changed something or you have any idea how i can switch back or fix this?

EDIT: i have logs if soemone want to see,most of them says info_callback: ignored or SSL connection error

Can you please check this out and tell us whether it works for you?

I can access all files via browser on my phone,but cant in my app.
Im using volley library for android to make connection with site i will look on their side for help too,im not sure maybe they have changed something.I tried all above methods except factory reset,since it stopped working on all devices under android 5.0 so i think its not directly phone based error.