The third led is blink and the last one is off the drone is on but the controller can't find the aircraft

Mine does that on occasion and I don't know why. I just restart both items (drone first, controller second) and it suddenly works as it should.

Question ... are you saying the LED lights on the Controller ?  That you have two solid and third one is blinking ? That means you have about 60% battery charge in the controller.

What you need to check is LINK of RC to AC ...

Check in the manual the Re-Link instructions and follow those .. so you get GREEN light on Controller and GREEN LED on AC ...

Nigel

How do I check That check is LINK of RC to AC ...  

Is the recessed light under the AC red or green?

Juli12345678 Posted at 2018-1-11 09:16
How do I check That check is LINK of RC to AC ...

Sir, what is the model of your device? Please tell me firmware of your RC and AC. I would recommend you ensure that both of them are the latest firmware. Please keep us updated, thanks for your support.

I updated them and it still does not work

I recently crashed my P3 pro and can’t get the ac and rc to connect.  I have the latest firmware upgrade and everything worked fine before the crash.  No error signals.