Here I was referring to the Teracube community, see Post #4
Reviewing my input so far, the evidence starting from
"Writing ‘recovery’ FAILED (remote: ‘This partition doesn’t exist’)
points to the device being soft bricked. I did not say strongly enough I would not now use platform tools. I merely linked perhaps too much reading material for you to try to deduce your own way forward with people is the same position of Teracube + Easy Installer + stopped mid process.
I suggested try with Easy Installer only. this was based on the possibility that Easy Installer could pick with adb but would drop the job and not experiment with irregular adb commands, and you would have by then read how to collect the log in the linked post
Please compare with Installation stuck in recovery mode after easy-installation
… because it links to Teracube stuck in bootloader while flashing easy installer and thence Howto troubleshoot issues with the easy-installer with a potential solution. Again I cannot tell if this is your problem from what you say.
Perhaps too indirect but I do not know the answer. My experience with a Super partition device is that stopping the install flow mid stage causes “Partition does not exist”.
With this newly “American designed” phone there is very little other back story and I see no mentions of the standard way to fix qualcomm issues with their especially designed flashing proposal. Speculation, maybe like Motorola they do not want to release the method and support it free of charge.
Hence my suggestion to read the Teracube proposal – top of this post.