# Unable to upload firmware

**URL:** <https://discuss.px4.io/t/unable-to-upload-firmware/17791>\
**Category:** PX4 Autopilot\
**Created:** [July 22, 2020, 10:06am UTC](https://discuss.px4.io/t/unable-to-upload-firmware/17791 "2020-07-22T10:06:10Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ciryca](https://discuss.px4.io/letter_avatar_proxy/v4/letter/c/e0b2c6/32.png) [@Ciryca](https://discuss.px4.io/u/Ciryca)\
**Post date:** [July 22, 2020, 10:06am UTC](https://discuss.px4.io/t/unable-to-upload-firmware/17791/1 "2020-07-22T10:06:10Z")

</div>

Hello,  
I am working on the first program following the guide.  
uploading process works well before writing “subscribe messages” part. Compiling succeed.  
Maybe relates to bootloader?  
Thanks!  
Here is what happened.

 ![image](https://discuss.px4.io/uploads/default/original/2X/4/40252238643a03494c6e348d8d0e8e84f5e9b3d5.png)