Hi
I am a beginner
I purchased kk2.1.5 from ebay.in.
Sensor test showing not ok and acc calibration failed
 pliz help

Try reflashing the firmware. If that doesn't work, you may have a bad board.

Thanks for replying
If there any way to find out its a bab bordbord 

What's a bab bordbord?
Some new technology or just bad typing?

First try a full reset. If that doesn't work, try reflashing the firmware. There are plenty of tutorials available online. If even a reflash doesn't work, there is a good chance that the board itself is faulty.

Hi
Thanks again 

Sorry for bab its "bad board"....

I did full reset but the problem is still the same ....
Maybe flashing solve this issue. .
Serching for flashing tools...

You have a faulty sensor. Those values are wayyy out of bounds for normal operation. If flashing the board did not help, you can try this. I think the kk 2.1.5 uses the gyro/acc chip from invensense.

1) Locate the sensor chip on the board. You will find it just above the screen. Search on google and you should find the location.
2) With the board powered, navigate to the screen that displays the sensor data.
3) Press firmly on the sensor by laying it on a non conductive flat surface. make sure you don't touch the sensor with your bare hands. Use gloves if possible. Sensors are usually sensitive to static electricity.
4) If you see the sensor readings change and come to normal while holding down the sensor, you most likely have a dry solder joint somewhere. Please proceed to the next step only if you see a change in the reading.
5) Carefully shield the screen and apply heat to the chip using a hair dryer or similar tool. Ideally, a hot air re-flow iron is used but not all of us have it. Apply hot air to the chip in intervals of 1 minute and then press down gently on the chip to help make a good electric connection. Be careful as the chip will be quiet hot after you apply hot air. Wear gloves before you apply pressure on the chip. You can also seek help from a local electronic repair shop if you're not comfortable performing this task by yourself.

Hope this helps. Let us know how it goes.

Thanks my dear friend I  for your help...

I tried with gloves But there is no change in sensor values ....

Maybe flashing is the hope  .....
Ordering for USBASP USBISP AVR Programmer Adapter....

Any other suggestions