Ok, let's see some action here!
The GoCo7 should use the standard procedures as anything else.
The GoCo7 and the Go103 use the same processor, SM6225 (and the same Firehose loader).
The GoCo7 is eMMC and the Go103 is UFS.
The Firehose loader for both is (temporarily)
https://github.com/bkerler/Loaders/issues/97
First, enable Developer options, enable USB debugging, install Windows ADB drivers.
Go to
http://www.temblast.com/edl.htm, read, download Zadig, download edl.exe, install Zadig WinUSB
Code:
edl /lsm6225.bin
edl /g -- just for fun and a sanity check
edl /r /pboot_a boot.img
edl /z
That's enough for now.