I read that i can open the engineer mode with *#9646633#
thats cool, but what can i do there and what are the highlights?

Can i make my mic or speaker louder? or what is it for?

Or is it only for testing and infos?

it's for testing, calibration and for "hidden" settings. You can also change the speaker level. (Hardware testing>audio>volume>...). But be sure what to do when you change other settings you don't know. This could give strange results.

OK thanks. Is there something i should change? Like the speaker or something?

Is it also possible to make the phonecall(speaker) louder?

Holefighter wrote:

Is it also possible to make the phonecall(speaker) louder?

yes. just increase the value of loudest setting

And what can i do with the camera settings in the Engineer mode?

Holefighter wrote:

And what can i do with the camera settings in the Engineer mode?

If you don't understand the settings there please don't change it!

OK. I thought i can fix my camera because the camera will not focus. AO i habe to send RhE phone back to blackview