I have an orange pi 2e running armbian, after using armbian-config to switch to the mainline kernel, my board wont boot ( no display output ) I tried running armbian with a new image on a SD card but the board wont turn on ( also no display ) any ideas?

Mainline support for H3 is not (labeled) stable yet. There was a regression in HDMI driver and your board should boot but without a display. If you build your own image, the display should also work.

After updating i can't detect my device on my network.

42 minutes ago, joeltoh95 said:

After updating i can't detect my device on my network.

We can help only with stable builds. Here, ... there are too many possible problems. In this case, you need to attach a serial console to see where it stops. But I would rather suggest you start and stay on stable builds until those mainline are not fully stable. If you want to use the mainline/modern kernel anyway, you have to be ready that sometimes you will need to rescue your system manually. It's simply not yet polished for end users.

Add. There was a change in upstream network driver on all H3/H5/A64 boards a few weeks ago and it broke everything. I managed to fix H3/H5 while A64 remain broken. 

Don't mind me asking. How do I attach a serial port to the SBC? I am only familiar with ethernet/usb based console ports on servers.

http://linux-sunxi.org/UART