Unpacking the unsigned system image using fbwintools
1. Now we are trying to unpacking a regular unsigned system.img in Ext4 FS. Type 3 and hit Enter

2. Type 5 depending on the file system (most system.img are Ext4) and hit Enter

3. The tool should list all img files within the unpack folder. Choose the number that corresponds with the file you intend to unpack. Here is 1 then hit Enter

4. Wait while the tool unpacks the img and once its done, you should get the message "Extract finish success". Press any key to proceed then you can now exit the tool

5. To locate the extracted files, navigate to the FBwintool folder > unpack > the folder bearing the name of the file you just extracted. You should find the extracted files here

Link: http://www.antgsm.com/showthread.php?t=253214
Credits: Vin2809 for Fbwintool
1. Now we are trying to unpacking a regular unsigned system.img in Ext4 FS. Type 3 and hit Enter

2. Type 5 depending on the file system (most system.img are Ext4) and hit Enter

3. The tool should list all img files within the unpack folder. Choose the number that corresponds with the file you intend to unpack. Here is 1 then hit Enter

4. Wait while the tool unpacks the img and once its done, you should get the message "Extract finish success". Press any key to proceed then you can now exit the tool

5. To locate the extracted files, navigate to the FBwintool folder > unpack > the folder bearing the name of the file you just extracted. You should find the extracted files here

Link: http://www.antgsm.com/showthread.php?t=253214
Credits: Vin2809 for Fbwintool