The problem that macOS will not start by updating OpenCore

[DiamondGotCat]

I'm sorry, I'm Japanese, so I'm using translation.

Therefore, there are some strange words. Please understand.

1. About this problem
   I had a problem in the following environment.

iMac 21.5-inch(2013-Late)

Intel Core i5

Intel Iris Pro Graphic

External drive (SSD)

OpenCore(I don't remember the version clearly, I think it was 1.2.0)

2. Why did this happen?
   Updated from OpenCore 1.1.0

3. What is the current situation?
   The boot picker is displayed, and the startup goes well up to 1/10. However, it will not be loaded for a long time after that.

4. What I tried
   I tried clearing NVRAM, but it only got worse.

TechCat56