Hi there. Same thing happened to my account. I tried to login from another device (the laptop) and it kept prompting me to upgrade. So i did follow the prompt to unsync/remove a device but it kept popping back again and showing the UPGRADE prompt again. I tried removing the unused device from three different interfaces ie. ios/iphone app, windows laptop app and evernote web but the result are the same. There seem to be a deeper technical issue which wont allow the device to be unsynnced. I hope someone from Evernote tech department can help and solve this quickly as i am a quite heavy user of evernote and need to get this sorted out real quick.