> For the complete documentation index, see [llms.txt](https://tankmate.gitbook.io/tankmate/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tankmate.gitbook.io/tankmate/wi-fi-connectivity/reconnect-v2-wifi-level-sensor.md).
# Reconnect - v2 WiFi Level Sensor
{% hint style="success" %}
First, check that your sensor is not already connected! Press the **RESET button once** (short press) and watch the **status LED**. If you see a **solid BLUE (cyan)** colour for **5-10 seconds**, the unit is already **connected** to the network
{% endhint %}
### Reconnect a sensor using BlueConnect
* In the TankMate app, go to **Settings** > **Sensor / Tank Settings** > **Edit Network Settings**
* Put the sensor into BlueConnect mode: on the side of the sender unit - hold the **RESET** button for **6-8 seconds** then release.
* The status LED will **blink slowly** - **dark blue** - when in BlueConnect mode
* The unit will go to sleep to conserve power after 3 mins. Click RESET again to wake it up.
* Follow the prompts in the app. Further details on the [BlueConnect process can be found here](/tankmate/wi-fi-connectivity/using-bluconnect.md).
{% hint style="warning" %}
**NOTE:** as of November 2023, all v2 sensors **must** be running **firmware version 21 or above**. Sensors running an older firmware version will not be able to send data to the TankMate server - and will need to be manually updated. Contact us for details.
The firmware version no. can be seen on the (expanded) home screen of the app.
{% endhint %}
{% hint style="danger" %}
**NOTE:** WiFi passwords that include the **$ symbol** are not currently supported by some older TankMate sensors. We recommend modifying the password, or setting up a guest network with a different password.
{% endhint %}