There are updates in the most recent mainline kernel about the Odroid C0/C1/C1+ board:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?h=v4.20&qt=grep&q=odroid
The armbian image with the mainline kernel have not been updated. Could you please update it? I would like to use it.
You can officially drop the outdated version with the kernel 3.10. The Kernel 3.10 is not supported any more and have ton of security issues that wont get fixed.
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Any 3.3 V level UART USB dongle will do the job (for the C0/C1/C1+/C2), you can even use standard breadboard female cables to connect to the Odroid serial console pins: