Hi XDA I have tablet pc which is been caught in boot loop fir three years , i have taken it to the market , many people have seen it but none can fix it as people generally don't know how to backup stock ROM from the device it self , the only way they know is to flash a new ROM on to a tablet or phone , here in Karachi, Pakistan. here is the specs of my tablet PC Hardware : Sun4i Model : MID Build NO: crane_MID-eng 4.0.3 IML74K20120402test-keys Build Date: 20120402-022008 Andriod No: 4.0.3 Base Band v : __ Kernal v : 3.0.8+(icm@ubuntu) (gcc version 4.5.1 (sourcery G++ Lite 2010.09-50) #3 Fri Mar 23 16.05.30 CST 2002 U build v : __ LCD Driver IC : __ IMEI 1 : __ IMEI 2 : __ On the bottom right corner the green light is on , on the left side of the menu screen the status is this : Error : Don't install utils Error : TotalBytesPerChunk not found. Set default page/spare= 2048/64 !!! unknown ROM structure , back up not possible. also on root , back , recovery menu all buttons are visible. Please advise if you guys can help me . thanks in advance.