Cannot uninstall Mobile Security on Android 4.3

It seem I can't remove Mobile Security v8 from Samsung Galaxy S3 running Android 4.3. Steps i have taken below have failed:
1) Install v9 on top of it, its tell that there is older verson detected , please remove it first before using it.
2) On GUI, click on uninstall but nothing happen. The screen just disappear. Nothing happen afterwards
3) Tried to stop the process and force uninstall it
4) Use third apps to remove it
If i can get the v8 installer in apk, i will try to install it and remove it. Please let me know if there any way to remove it. Hard
Reset the phone is not an option.
Phone : Samsung Galaxy S3 GT-I9300
Android : Android 4.3
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Any update on this issue ?????
Hi
You can try this.
Settings -> safety -> device administrators and uncheck F-Secure then you go to apps and try uninstall it again.
Hello
Just to check with you. Were you able to remove Mobile security v8?
Br
Emil
Yes..
Okey, good.
Br
Emil
Just wondering if you did according to
http://community.f-secure.com/t5/Security-for-PC/I-am-unable-to-uninstall-the/ta-p/15776
That worked for me except that did not have to enter any code.
My subscription was expired.
Hi
Have you try clean master?
https://play.google.com/store/apps/details?id=com.cleanmaster.mguard&hl=en
https://play.google.com/store/apps/details?id=com.piriform.ccleaner&hl=en
https://play.google.com/store/apps/details?id=com.avg.cleaner&hl=en
https://play.google.com/store/search?q=uninstaller&c=apps&hl=en