In case anyone is interested, a Helios 4 is for sale in the UK on eBay -
http://rover.ebay.com/rover/1/710-53481-19255-0/1?icep_ff3=2&pub=5575378759&campid=5338273189&customid=&icep_item=264729497930&ipn=psmain&icep_vectorid=229508&kwid=902099&mtid=824&kw=lg&toolid=11111
@jimbolaya, I know it's quite late, ch341 driver would be included on next release. Refer to commit 14a0a54.
@smith69085, we have updated the wiki page how to use the GPIO for button. You can take a look on
https://wiki.kobol.io/gpio/#use-gpio-with-device-tree-overlay
But currently the base dtb (armada-388-helios4.dtb) on Armbian 5.91 is still not compiled with overlay support. You can download the attached dtb, rename and replace the dtb on your system.
lk4.14_armada-388-helios4.dtb is for Armbian Default (Stretch, Linux Kernel 4.14)
sudo cp lk4.14_armada-388-helios4.dtb /boot/dtb/armada-388-helios4.dtb
lk4.19_armada-388-helios4.dtb is for Armbian Next (Buster, Linux Kernel 4.19)
smith69085 got a reaction from gprovost in Helios4 Support