Okay guys it seems like there is a few of you that are having issues with files and permissions. Let me see if I can help out here.
First thing is are you rooted? In the phone go to where all the apps are. Do you have the ninja icon? If not then forget it go and root the device. You can find how to do that all over the internet, google it. Next if you do have that and you have the terminal emulator icon open that. If you do not have the terminal emulator icon and can go to the market go and get it from the market. In terminal emulator type su and press the enter key. It should respond with a prompt like this # and nothing else. If you get this you should be good. If you want to double check this then after # type whoami and press enter. root is unknown uid 0. If you get something like unknown uid 10047 then you are not root. But the # prompt is root away so this step is really not needed.
Okay we got the root thing out of the way lets move to the file copying and permissions. Reboot your phone to make sure you are starting from scratch. After the phone is back on plug it in to your usb and in the notification window click on the usb connected and then click on the mount button. Close the windows autorun and open cmd.exe
cd to your android tools folder ie. cd C:\android\tools then type adb remount. Here you should see *daemon not running. starting it now* *daemon started successfully* and then type adb shell then you should see # (remember that from earlier?) now if you have done the adb push commands before then lets check on them. type cd /system/bin and press enter. It will show # again then type ls and press enter. scroll back up and look for u2nl. The process is the same for autostart.sh this time type cd /data/opt/ press enter then ls and enter again. If you don't see these then type exit and start with the adb push commands from the how to. Remeber you need to have those files in the right spot (C:\android\tools\u2nl and C:\autostart.sh if you want to type the commands word for word) Otherwise type the push commands in based on the location of those two files in your windows system.
This should also solve the permissions issues. After these files are in the right spots the chmod command should work. If you have problems with this PM me and I will get back to you. Also for the create a folder question, if you are in the terminal emulator make sure you are root or do this in adb shell. cd to the location that you want the folder ie /data/opt or whatever and type mkdir (name of folder) otherwise type the full path mkdir /data/opt/(name of folder) either way works. Remember to chmod the folder after you create it to insure that it has the right permissions.
Hope this helps, let me know if I need to be more clear.
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