Hello guys,i just want to know how do altitude hold with my kk2.1.5 board.I came to know about this through a simulator,so it is very easy for me to train with altitude mode.But i really don't know exactly how to do that with my kk board.Please help me!

kk2.1.5 board does not support altitude hold.....you will have to upgrade to NAZA/APM or any other 10 dof FC

But there are few videos on YouTube. Now i cant upgrade to naza or to any other FC.There should be an alternative, please help me!

Follow those YouTube Videos which show you how to use altitude hold on a kk2.1.5.
I did a quick search and I couldn't find anything. The main reason is that the KK board doesn't use GPS and for altitude hold you need GPS. If you can't buy an APM then my friend you can't use the altitude hold feature. A lot of people have trained with a KK board without altitude hold and I think you should learn it that route too. That's the best course of action for you.

All the best
Nitesh

Barometric pressure sensor, is required for altitude hold. Any FC with a barometer will provide what you are looking for, but I agree with rcrcnitesh, you should try to master throttle control, it will help you in the future.

Regards Ashim.

K thanks for your suggestion,I'll do that