Sense 2 won't turn on since software update

[Mantis252]

I just got my sense 2 this week. Set it all up etc. Since a software update Thurs, my watch has just turned off as if out of battery. It's fully charged. When I try and turn it back on, it shows the start up icon, then a big red x. I have followed the instructions of Bluetooth, remove from acct. now it won't let me readd to my acct. I get to point of being asked the 4 digit pin, but watch never shows numbers. 

[DavidFitbit]

Hi @Mantis252 Welcome to the Fitbit Community! It's great to have you here! Allow me to help you with the red cross you device is displaying. I appreciate the troubleshooting you've already tried.

If you haven't done so, i recommend that you restart your Sense 2 by pressing and holding the button for 10 seconds until the Fitbit logo appears on the screen, and then release the button. Then, i encourage you to retry the setup

If you still find trouble setting your device, i suggest that you try it with another compatible mobile device. 

I hope this tips will get you back on track !

[Tabi1014]

I got my Sense 2 July 23, 2023.  I have started having the same issues as Mantis.  I have restarted the device several times.

The battery drains quickly and takes a long time to charge.  At random times, the logo comes up.  I do not think I have anything extra running.  I am using a clock I have used before.  I have the brightness set to dim and wake to button.  
What else should I be looking for to keep this device from being a dud not long after the warranty expired?

[DavidFitbit]

Hi @Tabi1014 Welcome to the Fitbit Community! I appreciate the troubleshooting you have tried.

Have you seen the red cross after an update ? I you have, then try to setup your Sense 2 as a new device :

- From the Today tab (sunrise) in the Fitbit app on your phone, tap the devices icon (mobile and watch).
- Tap Add more devices.
- Choose your device and follow the on-screen instructions to continue.

Regarding the issues you are having with the battery, see if the tips included in our help article Can I extend my Fitbit device's battery life? > What are tips to extend my Fitbit device's battery life? are helpful for you.

If you find trouble charging your device, check our help article Why isn't my Fitbit device's battery charging? to see if that improves your experience.

I hope you'll find a solution for your issues a get back on track !