# Due won't start after power off-on, have to reset

**URL:** <https://forum.arduino.cc/t/due-wont-start-after-power-off-on-have-to-reset/247763>\
**Category:** Due\
**Created:** [July 23, 2014, 4:50pm UTC](https://forum.arduino.cc/t/due-wont-start-after-power-off-on-have-to-reset/247763 "2014-07-23T16:50:40Z")\
**Posts on this page:** 1\
**Showing post:** 43

<div class="post-metadata">

**Author:** ![nostar](https://avatars.discourse-cdn.com/v4/letter/n/8dc957/32.png) [@nostar](https://forum.arduino.cc/u/nostar)\
**Post date:** [November 2, 2015, 2:23pm UTC](https://forum.arduino.cc/t/due-wont-start-after-power-off-on-have-to-reset/247763/43 "2015-11-02T14:23:08Z")

</div>

I have 10+ DUE R3 models, 6 DUE R3-E models, 2 SainSmart brown-PCB DUE boards, and 1 SainSmart red-PCB DUE. All of the R3 boards and the red SS DUE fail to start up after a powerup and require a manual reset. All of the R3-E boards and the brown SS boards start up perfectly upon powerup every time. Seems like the red SS is a clone of R3 and the browns are of R3-E.

I am going to flash the 16U2 on one of the R3 boards with the reset code from this thread:  
[http://forum.arduino.cc/index.php?topic=167492.msg1373055#msg1373055](http://forum.arduino.cc/index.php?topic=167492.msg1373055#msg1373055)

Meanwhile, the question to Arduino remains unanswered: "WHAT IS THE DIFFERENCE BETWEEN R3 and R3-E??"

I suspect that it is a 16u2 firmware change similar, if not identical to the one in the mentioned thread.

UPDATE: Flashing the 16u2 with the reset code from the above forum posts works. This is better solution than hardware mods.

---

_[View the full topic](https://forum.arduino.cc/t/due-wont-start-after-power-off-on-have-to-reset/247763)._