Cannot remount /system partition even when rooted (Sony xperia M2) - Android General

I have a Sony xperia M2 D2303 with kitkat 4.4.4 and compilation number 18.3.1.C.1.17.
I have successfully rooted it using KingRoot v4.9.5.
Also I have checked that system is rooted using tools such as root checker and it says rooted.
Now, I am trying to remount /system partition as RW but without succcess.
I have googled and tried several solutions posted here but nothing works for me.
Access to /sys/kernel/security/sony_ric and try to disable sony ric security using:
problem here is that sony_ric folder is empty, I mean, there is no "enable" file and I cannot create it as partition is RO (read-only).
Using ES file explorer or other file explorers as root I have tried to remount partition as RW but it fails.
Code:
echo 0 > enable
Using ROM Toolbox pro, and then from terminal emulator I have tried some commands:
Code:
su
mount -o remount,rw /system
fails.
Code:
su
system/bin/mount -o remount,rw /system
also fails.
Code:
adb shell
su
mount -o rw,remount /system
also fails...
I have tried to install busybox but it fails as well.
I have tried the method explained here but when executing the command:
sh /sdcard/mrw/root.sh
some errors appear as script tries to do things in /system so since it is read-only (not rw) it fails.
Also I have tried the method using SuperSu-me explained here but without success. It completes ok but then SuperSu is executed automatically. SuperSu says to update binaries so I update binaries, then another screen comes saying that another root app was detected, so I press the button to uninstall it and continue installing SuperSu. SuperSu says "Installing ........" and then it crashes, that is, it appears a screen with two buttons, "How to update" and "Reboot". Kingroot, purify apps continued installed and working, and I cannot replace them with SuperSu.
So at this point I have no idea what to do...
My conclusion is that all these tools need to make changes to / and /system but since I have these two partitions set to read-only (cannot make them rw) then all these tools fail. So I think the main cause is that I have / and /system readonly.
Any help will be highly appreciated.
Please, help!

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adb shell or use a terminal app and have superuser on the phone and have the screen on (if using adb) in case you need to allow superuser.
su
mount -o rw,remount /dev/block/stl9 /system​Then uninstall.

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Using the adb method I have managed to "root" my tablet. Further more I have been able to remove bloatware from the tablet using SystemApp Remover (couldn't seem to get the job done with adb). In order to make SystemApp Remover work, I had to first use adb to send the line "mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system" or it would not allow me to remove system programs from the device. I used adb to install several programs including Android Market app from Google, root explorer, etc. I then attempted to install "setcpu" by copying the apk file to my sdcard root and installing from there. NO JOY, it simply returns "not installed" Anybody got an idea what I'm doing wrong?

Can't remount /system in read-write mode.

Yes, my phone is a chinese Hero H2000+.
I have managed to stick su and busybox into /system/bin using debugfs, but there's absolutely no way I could find to make /system get into read-write mode.
If I type "mount -o rw,remount /system" it seems to work for about 1 second, but then it's remounted read-only. All the changes will be reverted (files I add/remove via script). If I try to run the same command again, it will show me a message saying filesystem is read only.
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[Q] Rooting Arnova84

Hi,
I just bought a cheap simple ARNOVA84 tablet (for 50 €) with android 2.1 to play a little bit and gather experience regarding rooting before I do this on my acer A511
I came so far, that I got adb shell with root ($ -> #). But to get SuperUser or SuperSU running I need also su in /system/bin. But /system is ro. The command
# mount -o rw,remount /dev/mtdblock4 /system
does not work in any combination. I get no error, but
# mount
still shows /system ro
To remount /system google said, I would need su, which in turn I don't have yet I copied su binary to another folder and changed permission to 755. But nevertheless su seems not to work. It just gives me new line with no # and everything I type in, is repeated. I have to break shell with ctrl-c.
The /system is a cramfs and my latest information is, that cramfs is always ro and can not be changed.
1. Is this true and does it mean I can root my tablet only be upgrading it with a modified update.img containing su etc.?
2. Is there no other more safe way to root such device?
3. Does this also mean more modern tablets have another filesystem for /system?
thanks!
Rainer

successfully rooted but cannot make /system rw

i am trying to remount system as -rw but cannot do so. i want to install a few apps as system but you can see my problem. when i do it through terminal emulator it says "mount: '/dev/block/sda22' ->' /system': Device or resource busy
anyone?

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