1
00:00:01,080 --> 00:00:04,740
Challenge 4 Here's what we know.

2
00:00:04,740 --> 00:00:09,100
We've restored communication with the payload module, but we still can't operate it.

3
00:00:09,100 --> 00:00:10,180
The challenge?

4
00:00:10,220 --> 00:00:14,900
Now teams must restore normal operations of the payload module so we can access the imager.

5
00:00:15,220 --> 00:00:16,740
Here's how they do it.

6
00:00:16,740 --> 00:00:23,000
Teams discover that the payload module bootloader has been corrupted, which is why the payload module is not operating normally.

7
00:00:23,000 --> 00:00:34,340
The teams discover a system console to the payload module and the ability to access the payload module system console by controlling an undocumented GPIO and multiplexer on the CNDH board.

8
00:00:34,340 --> 00:00:41,500
The teams must write a custom flight software application that can control the GPIO and enable access to the payload system console.

9
00:00:41,500 --> 00:00:46,400
After writing the application, the teams must upload it to the CNDH and execute it.

10
00:00:46,400 --> 00:00:51,400
Once the teams have access to the system console, they will identify that it has been corrupted.

11
00:00:51,400 --> 00:00:59,340
The teams will need to research nominal kubos bootloader configuration and repair the payload module's bootloader to resume proper operation of the payload module.