[Huawei Ascend Mate 2] that1guyyep101:
Model Number: MT2L03

Build: MT2-L03C00B322

Android version: 5.1

EMUI 3.1

Not rooted.

Not sure exactly what the issue is. I think it needs a new battery. Because when it gets down to 10% left it will randomly go down to 2% all of the sudden, then I will get that message saying "phone powering off" then the phone is difficult to ever get back on... which is why I try to never let the battery go completely dead.

Anyways the other night it went completely dead..... I charged it for forever it seemed, I noticed it was a little warmer than usual.

I ignored it and left it plugged in.

The next day I took it apart (I have taken it apart before, and put it back together with everything working fine)

Reason I've taken it apart in the past is because I had to replace the lcd screen because the other one got sat on and it shattered.

So I have an originally white phone with a black lcd screen....

Anyways I took the phone apart again, looked at the battery to make sure it wasn't bloated or warm anymore. It was fine.

I turned it back on and I noticed when I open the stock camera app it kept saying "can't connect to camera" or something similar.

So I took it apart again, unplugged the camera and plugged it back in, tried rebooting the phone, and when I opened camera again the phone then rebooted itself a few times.

Now instead of getting the message of "unable to connect to camera" it's as if the phone doesn't see the rear camera at all anymore.

The flash for the rear camera doesn't work anymore either.

I got it to turn on for a while, when it couldn't connect to the rear camera, but then it didn't want to turn off, then the phone rebooted itself, and now I can't get the rear camera or the flash to work.

The front camera works fine. But as for the rear camera there are no options to switch to it like there used to be.

On the top of the camera app there used to be a sort of "refresh" icon that would switch between the two cameras, that's gone though.

I also tried downloading apps that tell you about android hardware... and they say for secondary camera something like "not detected"

I made sure though.... the rear camera is plugged in all the way.

I even tried the backup and reset thing....

I don't know how to boot this model of phone into safe mode. I tried holding the power button, but I'm not sure if you hold the physical button, or long press the power icon on the screen???

I opened the camera app and went to settings and restored defaults.

I also tried opening app info for camera and clicking clear data. Neither helped.

How do I get android to see that there is a camera there?

Would downgrading the phone to the original build it was on help?

I think it was originally android 4.3.

Edit: So my main questions are... how do I boot into safe mode?

Would rooting it and clearing the dalvik cache work maybe? Isn't that what causes android to say "optimizing app X of X" when booting up?

How do I root this phone? After I root it would there be anything I can do to troubleshoot the rear camera or flash?

It just seems weird to me that one minute it says it can't connect, but the flash was working. Then the phone rebooted itself, and now it doesn't even seem to realize that there is a rear camera plugged in. And now the flash for camera isn't working either. Even did a backup and reset.