S7 - Easy Installation failed

When we follow the hashtag easy-installer which I added to your OP we see a run of similar reports for the Samsung S7, and other.

S7

S8

S9

What sticks in my mind is that the e-recovery does not seem to be able to handle being flashed to a “new device”. I think especially the newer threads had this issue but it does not apply to all the threads I listed.

[1] Galaxy S8 does not reboot into e Recovery screen - #21 by Xxpsilon.