Hope This Helps-Calvin Mogilinski
Start by removing the device's battery and wait for a few minute's before putting it back in your phone.
OR Switch off for non-removable battery phones for five to ten minutes so it can remove any charge that is left in the phone and to initiate a complete power-cycle once you insert the battery.
Now Boot the device into Recovery Mode by pressing and holding the relevant shortcut keys for your device. For instance, most Samsung devices can boot into Recovery Mode while pressing the key combination Volume Up, Home and Power (for tablets it is Volume Up and Power). If using a HTC phone, boot into HBOOT first by tapping Volume Down and Power button together and then browse to Recovery using Volume Up/ Down buttons. If you cant get it to boot in Recovery you can always use (ADB) and type in the command] > adb reboot recovery <--- Hit Enter now your Device will reboot into recovery mode. If your not familar with adb or even know what adb is there is a link on the bottom of this page for the sdk download and a gude on the adb.
Now browse and select the option Wipe Data/Factory Reset in Recovery Mode.Check if the device can now boot into the newly installed ROM or firmware. If not, then perform Wipe Cache Partition And Return to the main Recovery menu and reboot the device by choosing Reboot System Now option.After Flashing or Installing a New ROM and If the device is already rooted with ClockworkMod Recovery (CWM) installed, then do the following steps (1) Remove you'r battery and reinsert it after 30 seconds. (2) Boot the device into CWM Recovery by pressing and holding Volume Up, Home and Power buttons together. NOTE: The key combination may vary depending on your device model.So, CONFIRM BEFORE YOU PROCEED. (3) Now Go to Advanced option in Recovery menu and choose Wipe Dalvik Cache. Then perform Wipe/cache under Mounts & Storage. Reboot the device and check if the boot loop issue is resolved. If not repeat the above three steps, but perform both Wipe/data and Wipe/cache under Mounts & Storage before rebooting.
After Setting an Incorrect File Permission.The Android operating system (OS) works on file permissions and hence incorrectly set file permissions may permanently damage or soft brick your device. Here are some of the commonly used file permissions:- 644 (RW-R-R) - (this is most common system permission, it exists in /system/app, /system/framework, /system/etc, /system/lib and allot of separate files) - 755 (RWX-RX-RX) - (mainly used for /system/bin) - 777 (RWX-RWX-RWX) - (used for scripts inside /system/etc/init.d and busybox files)
To fix or reset any of these file permissions, do the following:Boot the device into CWM or TWRP recovery Go to Advanced option.Click Fix Permission and confirm the action. After Restoring a Backup.If the bootloop error occurs immediately after restoring a Nandroid Backup, follow the steps on -(#:2)- to fix it. If everything else fails, just try re installing the original ROM or flash the first official firmware.