# Update of the firmware makes that my project doesn't work

**URL:** <https://forums.digi.com/t/update-of-the-firmware-makes-that-my-project-doesnt-work/21344>\
**Category:** XBee - Zigbee\
**Tags:** firmware-update, issue\
**Created:** [May 7, 2020, 1:56pm UTC](https://forums.digi.com/t/update-of-the-firmware-makes-that-my-project-doesnt-work/21344 "2020-05-07T13:56:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MariaC](https://avatars.discourse-cdn.com/v4/letter/m/9dc877/32.png) [@MariaC](https://forums.digi.com/u/MariaC)\
**Post date:** [May 7, 2020, 1:56pm UTC](https://forums.digi.com/t/update-of-the-firmware-makes-that-my-project-doesnt-work/21344/1 "2020-05-07T13:56:56Z")

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I’m doing a project using the xbee3 Modules. When i test the project with the oldest firmware Version (1003) the project Works perfectly. But when the Module has a new firmware (100A or 1009) the project doesn’t work at first. What i have to do is to short Circuit the Tx with Rx of the Module for a short time and begins to work. Can someone explain me why does it happen?

Thanks

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [May 7, 2020, 1:59pm UTC](https://forums.digi.com/t/update-of-the-firmware-makes-that-my-project-doesnt-work/21344/2 "2020-05-07T13:59:37Z")

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That would have to be something in your code that is causing the issue. Are you able to send and receive data with the new firmware not using Micro Python?