My iphone version stoped since 12.4

If your iPhone, iPad or iPod touch won’t update - Apple Support

Well, you’ve told us nothing about your situation. We don’t know how you tried to update, what you saw, what worked, what failed ...

We don’t even know what iPhone model you have. Check Settings > General > About > Model and report the results here.

• How did you attempt to update?
• If you used iTunes:
  • What was its version number?
  • What operating system name and version number?
• What did you see?
• What succeeded?
• What failed?
• What else can you tell us and not ask us to guess?