@lipeis Hi, thank you very much for the feedback. You mean the issue happens after the firmware update of the router or after App update? and what is the version of your Tether App now? Please share...

@TertianIvy Hi, How do you confirm the TP-Link ID is forgotten by the router? When you login the router web interface, please do use the TP-Link ID to login instead of the local password, or the...

@SKID_72 Hi, I've replied your private message as well, please make sure you've followed the correct steps and if firmware recovery doesn't work, I am afarid you will need to check warranty to get it...

@4Get Hi, I have replied your private message, please check if it works.

@Mr_Tee Hi, thank you very much for the reply. We would like to escalate your case to the support engineers, and they will help follow it up, if you are willing to do further analysis, please check...

@SKID_72 I've seen you in other posts and replied, please have a check: https://community.tp-link.com/en/home/forum/topic/634470?replyId=1269760