Help getting my tablet back to stock - Android Q&A, Help & Troubleshooting

Hi everyone.
I bought my Acer a500 tablet second hand and I didn't know that the previous owner had rooted it but no too long after that this happens every time I turn it on.
Can someone tell me in simple terms how to fix it ? A clear tutorial might be helpful.
I've attached a pic for you all to see what's wrong.
Looking forward to all your replies
Thanks in advance
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Try booting the primary kernel image. You can use the volume keys to select the options.

I have tried that and it doesnt do anything ...

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[Q] Need some help with crane-C12

Hello guys!
First I am new in android
I bought a car DVD player : http://www.erisin.com/erisin-es8835a-capacitive-screen-android-40-car-dvd-mid-player_p456.html
My first problem with this:the internal memory is only 252MB.....
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It was a rooted device so I can install cwm after a lots of google to find the right version.
Did a backup got this:
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Until this time I couldn't made a working ROM.
Here is the build.prop file in txt: http://dl-1.va.us.xda-developers.com/3/0/3/5/1/6/1/build.prop.txt?key=66A52_o-r5J_fkDU19JIJw&ts=1417018652
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You can di factory reset from bootloader menu :
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I already tried. Still the same. When i connect to wifi tons of app keep downloading itself...

Screen overlay with system info?!

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https://photos.app.goo.gl/Ff2UIJLJ6VR1bgAl2
Thanks in advance!
I've seen that before. Its factoryapp. Factory mode.
If you didn't enable it yourself then you know an app for that.. one you downloaded probably did it.
You need root to fix it. No root means flash back to stock.
Find efs/factoryapp/ and open the factoryapp file with a text editor and change its contents to the opposite of what it is now. Save and exit. Reboot phone.

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I try the following solutions but they don't solve problem:
1- I added new original stock firmware... and the problem still same..
2- I did a hard reset... and no change..
Please anyone help me?
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"lightbox_toggle_sidebar": "Toggle sidebar"
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