# XBEE Series 2 working as Router/end device but not as coordinator

**URL:** <https://forums.digi.com/t/xbee-series-2-working-as-router-end-device-but-not-as-coordinator/2401>\
**Category:** XBee - Zigbee\
**Created:** [October 17, 2010, 12:30pm UTC](https://forums.digi.com/t/xbee-series-2-working-as-router-end-device-but-not-as-coordinator/2401 "2010-10-17T12:30:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Windy](https://avatars.discourse-cdn.com/v4/letter/w/91b2a8/32.png) [@Windy](https://forums.digi.com/u/Windy)\
**Post date:** [October 17, 2010, 12:30pm UTC](https://forums.digi.com/t/xbee-series-2-working-as-router-end-device-but-not-as-coordinator/2401/1 "2010-10-17T12:30:27Z")

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Hello, I am new to xbee technology and have just been given 6 xbee Series 2 controllers to setup for a friend.  
I am using x-ctu latest version on Windows 7.  
I am programming the chips using a sparkfun explorer connected to the pc and have a remote unit with an arduinoXbee shield.  
I am using XB24-B ZNET 2.5 ROUTER/END DEVICE AT 1247 and XB24-B ZNET 2.5 COORDINATOR AT 1047 .

From the 6 XBEE units I am able to get 3 of them working and communicating as either router/end device or coordinator, 2 of them will only work as router/end device and one works as neither.

Apart from the one which does not work at all, I have no problems uploading the firmware to the chips through the explorer and I am using the default settings for all of them.

The one which does not work at all when i try to upload I get one of the following errors; unable to find the modem, lost connection with the modem and failed to write to the modem.

Does anyone have any suggestions, I am lost.

TIA

Dave

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**Author:** ![16ksa23](https://avatars.discourse-cdn.com/v4/letter/1/aeb1de/32.png) [@16ksa23](https://forums.digi.com/u/16ksa23)\
**Post date:** [September 18, 2013, 1:31am UTC](https://forums.digi.com/t/xbee-series-2-working-as-router-end-device-but-not-as-coordinator/2401/2 "2013-09-18T01:31:20Z")

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You need to reflash the firmware on the non working modules using standard procedures.  
Refer the following link, [http://todigi.blogspot.com/2010/05/xbee-obituaries-xbee-returns-from-grave.html](http://todigi.blogspot.com/2010/05/xbee-obituaries-xbee-returns-from-grave.html)