# Error during delta update

**URL:** <https://hub.mender.io/t/error-during-delta-update/4038>\
**Category:** General Discussions\
**Created:** [August 27, 2021, 12:39pm UTC](https://hub.mender.io/t/error-during-delta-update/4038 "2021-08-27T12:39:06Z")\
**Posts on this page:** 1\
**Showing post:** 22

<div class="post-metadata">

**Author:** ![kacf](https://yyz2.discourse-cdn.com/flex036/user_avatar/hub.mender.io/kacf/32/146_2.png) [@kacf](https://hub.mender.io/u/kacf)\
**Post date:** [September 6, 2021, 8:55am UTC](https://hub.mender.io/t/error-during-delta-update/4038/22 "2021-09-06T08:55:08Z")

</div>

Does it help if you put `ENABLE_UART="1"` in `local.conf`? We’ve had reports that this is necessary on recent versions of U-Boot, and this solves the problem for me after trying your config.

Some discussions about this [here](https://hub.mender.io/t/unable-to-boot-raspberry-pi-4-using-offical-image/3672/4) and [here](https://hub.mender.io/t/raspberry-pi-4-model-b/889/33).

---

_[View the full topic](https://hub.mender.io/t/error-during-delta-update/4038)._