Stop at "Got param RC6_TRIM"

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Open Mission Planner ver1.3.10, click on "Initial Setup" and click on 
"Install Firmware".
2. Click on any drone mode "Example: I chose the ArduCopter V3.1.5 Y6".
3. It will prompt "Are you sure you want to upload ArduCopter V3.1.5 Y6?".
4. Once click on yes, it will start to upload to the APM, you will see a 
progress bar and it will stop at "Got param RC6_TRIM".

What version of the product are you using? On what operating system?
- APM Arduicopter 2.6 from China. OS Window 7.

Please provide any additional information below.
- I bought 2 same APM from China, but only one is working and the other is not 
as mention above.
- This device is a duplicate item from China.

Original issue reported on code.google.com by coltrine@gmail.com on 18 Oct 2014 at 7:56