If you have connection timeout issue of Mi LED Desk Lamp, Mi Bedside Lamp, and the lamp has shown in your router’s DHCP list, please have a check if your xiaomi account is bigger than 4294967295 (32bit). If so, you can have a try with the following:
1、Logout your account and login with account: email@example.com , Password: yeelink1234 from Yeelight application.
2、Try to connect device with the account. Update firmware once connected, then reset your device and try again with your account.
PLEASE DONOT CHANGE PASSWORD!!