My router did not react well with latest update, 12/16/2021.In fact my router refused to connect

Are you looking for help?

 

Which router?

 

Which hardware version?

 

What happens?

 

Apologies for all the questions. But you can help people to help you by providing the information suggested in this forum's header:

 

Subject (Include model number and brief summary)
Model (Recommended - Helps the community give the best answers)
Body (Include additional detail including model version, firmware, OS and environment where relevant.)

They are there for a good reason.