I just received 3 of the Zero Plus boards and am trying to verify they at least basically work.  I'm new to Armbian & Orange Pi but have been using Raspbian & Raspberry Pi's for years.   I've downloaded Armbian for the OP Zero (Armbian_5.38_Orangepizero_Debian_stretch_next_4.14.14.img), verified the gpg signature and the sha256 checksum and used Etcher v. 1.4.4 on a 2017 iMac, macOS Sierra, to burn SD cards.  After burning, macOS claims "The disk you inserted was not readable b