Android 6 issue after several days update

[Jany]

Hello Everyone and Sony Team.
Firstly, I want to give a special thank to Sony Mobile Team who kept their promising to update Android 6 for Xperia C4 and C5 series.
After several days of using this version, I can say it is very good update version. However, there are some issues remaining which I want to ask here :

1. It is only 1.6G of RAM. After installing some basic apps, it has only 190M of memory. I must disable some apps to extend RAM. Then where is 400M of RAM missing?

2. Stamina mode is not useful. I cannot use during the day like Stamina on Android 5.1. If I enable it, a fixed notification bar always appear and it is unable to remove. And effects is disabled while Stamina is activated. I want to ask: How to turn on Stamina but keep effects (open apps, close app., etc).

3. Battery on Sleep mode is excellent but it is not optimized when using.
After disable almost apps, turn off some wifi features and app usage permission I have statistics about Battery consumption:
- Phone Idle: 36%
- Screen: 45%
- Wifi: 2%
- Cell standby: 2%.

I do not know why I used almost Chrome and Slither.IO game but I do not find these apps in Battery consumption? What is Phone Idle?

4. I found an app named is MTKLogger. Is it keylogger? I do not know what is this but it is safe?

5. I found com.facebook.appmanager is built as default app and impossible to remove. 

You have agreements with Facebook? I have never used Facebook then it is not allowed by Sony users when you integrated any third party apps as default apps.

Hey Sony, please explain why you integrated the third party app which misappropriates RAM. 

We will discuss this issue on XDA soon.

Thank you for taking time to read my article.

[YoGem]

Considering that marshmallow is probably the last stop for the C4/C5 it may make sense for you to seek a way to root it.. Question is, why?

1) you have to think that Sony may release a some bug fixes in the next weeks as there are few bugs,
2) unless you are a pro user you don't really need superuser access,
3) it may void warranty, if any,
4) you can activate adoptable storage without root.

And the list go on... So why do you need root?

[paul1234]

Hello everyone! Im having an issue with my c4. when transferring files to a computer

it displays "Waiting: Xperia c4 is busy". Please help. Thank you

[sumantaadk]

@YoGem I need root for changing mac and lot of other stuff. Do you know way to root without unlocking bootloader?