Was not able to upgrade...why?
 

I was trying to upgrade my hydrophone AT the START of my second mission but was not able to.

i was carful not to do anything before my first mission like it is said in previous posts.

I had 1700 renown after this first mission.

I was able to buy some more crew and, promote and give qualifaications to some crew members.

However like I was saying, I was able to see my renown on the upper left corner (in the U-Boat section of the main menu) but everytime I was trying to upgrade the hydrophone (available in 1939) the renown showing on the right side was showing ''0''!

We are still in September of 1939.

Anybody has an explanation?

Thank you