xbee 868lp not responding after firmware update

I used the xctu software ver. 6.1.2 to connect to the xbee 868lp (XB8-DM) using the xbee development kit. the connection was ok, the program read the current firmware and I pressed update firmware button. It started updating, but it ended with an error, and since then I cannot connect to the xbee. (when I first connected to the xbee the red led of the development board was blinking. after the failed firmware update, the 3 green led on the right of the usb are on.)
What can I do to restore the connection?

Try using the XBee Recovery function under the Tools menu in XCTU to recover the module.