# Serial Port on Raspberry Pi 3 B+

**URL:** <https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936>\
**Category:** Product support\
**Created:** [April 16, 2018, 8:04pm UTC](https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936 "2018-04-16T20:04:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![fritz](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/fritz/32/6305_2.png) [@fritz](https://forums.balena.io/u/fritz)\
**Post date:** [April 16, 2018, 8:04pm UTC](https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936/1 "2018-04-16T20:04:22Z")

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Hi,  
similar to the issues that came along with switching to RPi3 (from RPi2) there are again issues with the latest model of RPi (3B+).

Currently I am not able to get my Raspberry Pi booting with [resin.io](http://resin.io) and attached a serial device on the GPIO pins (as they wer working flawlessly with RPi 3).  
I modified config.txt and added:  
enable\_uart=1 and core\_freq=250  
but Raspberry Pi won’t boot at all (no green light flashing at any time, just permanent red light).

Any ideas?

Thank you very much!  
Best regards  
Fritz

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**Author:** ![floion](https://avatars.discourse-cdn.com/v4/letter/f/45deac/32.png) [@floion](https://forums.balena.io/u/floion)\
**Post date:** [April 17, 2018, 5:04am UTC](https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936/4 "2018-04-17T05:04:06Z")

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Hi. What OS version are you trying to boot your RPI3 B+ with?

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<div class="post-metadata">

**Author:** ![fritz](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/fritz/32/6305_2.png) [@fritz](https://forums.balena.io/u/fritz)\
**Post date:** [April 17, 2018, 5:38am UTC](https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936/5 "2018-04-17T05:38:58Z")

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Hi  
I’m using the latest resinOS 2.12.5.  
thanks

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<div class="post-metadata">

**Author:** ![fritz](https://sea2.discourse-cdn.com/balena/user_avatar/forums.balena.io/fritz/32/6305_2.png) [@fritz](https://forums.balena.io/u/fritz)\
**Post date:** [April 19, 2018, 9:55pm UTC](https://forums.balena.io/t/serial-port-on-raspberry-pi-3-b/2936/6 "2018-04-19T21:55:09Z")

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Hi,  
issue is resolved. Out of nothing it started to work, so I guess it was probably a hardware issue (not properly attached the module onto the GPIO pins)…

Sorry for the confusion,  
cheers