If you already KNOW you have a camera problem, none of the stuff below is particularly useful. You just need to respond to @helsner's post above.
If you aren't sure it's the camera, then sorry, but I am not sure exactly what you are describing. Not sure if you taking the SD card from the camera, or from the controller. Not sure if you swapped the camera from your mate's Chroma, or if you bound your ST10+ to both his camera and drone. The good thing is it sounds like you have a second full Chroma Kit available to swap things around and isolate the problem device.
Three things are the major players here. The Chroma, the Camera, and the ST10+.
1.) Start with your complete kit and see if everything binds (I'm sure it won't, of course, but need to do as a reference point.)
2,) Next, use his camera, your Chroma, and your ST10+.
3.) Try your camera, his Chroma, and your ST10+.
4.) Try your camera, your Chroma, and his ST10+.
If there is any doubt about the SD card, you can add that into the mix also.
Once you identify
If none of the above identifies the issue, It sounds like you need to run the step by step binding verification process. Please understand these are not just instructions for how to bind. It is a troubleshooting tool to look for the issue that is preventing the bind. You have to run EVERY step, even the ones where you think "I know I've already done that". Failure to perform every, single, step has led to more failures than anything else in this process.
After the initial setup steps, the sequence falls into a routine of "action" steps where you do something, followed by a "verify" step where you check the results of that step. If you find a step that does NOT meet the verification, STOP. Do not continue in the procedure. Come back to the forum and tell us what step it was, and what you saw. The same thing applies if you are just not sure of something. Again, stop, and come back to the forum to get help understanding what you see. The second most common cause of failure is when folks keep moving in the document when they should have stopped.
The binding verification document is Attachment 32 (Chroma Binding Verification) of the PDF document attached to "
Way To Fix Drones project".