Seems like the OpenWRT images for Globalscale Espressobin V7 posted on this page got corrupt at the time someone packaged them. I'm unable to extract them using 7-zip on Windows or on Mac, same error. Both Install and Upgrade files are corrupt, so all 4 files.
Can someone please re-up the proper image files which are not corrupt?
https://openwrt.org/toh/globalscale/globalscale_espressobin_v7
it's not corrupt... the image files contain a trailing signature which is safely disregarded by common *nix tools;
hexdump -C open.img.gz | tail -n20
00592d90 22 72 31 31 32 30 38 2d 63 65 36 34 39 36 64 37 |"r11208-ce6496d7|
00592da0 39 36 22 2c 20 22 74 61 72 67 65 74 22 3a 20 22 |96", "target": "|
00592db0 6d 76 65 62 75 2f 63 6f 72 74 65 78 61 35 33 22 |mvebu/cortexa53"|
00592dc0 2c 20 22 62 6f 61 72 64 22 3a 20 22 61 72 6d 61 |, "board": "arma|
00592dd0 64 61 2d 33 37 32 30 2d 65 73 70 72 65 73 73 6f |da-3720-espresso|
00592de0 62 69 6e 2d 76 37 22 20 7d 20 7d 0a 46 57 78 30 |bin-v7" } }.FWx0|
00592df0 7a 2a 80 ee 01 00 00 00 00 00 01 08 23 20 66 61 |z*..........# fa|
00592e00 6b 65 20 63 65 72 74 69 66 69 63 61 74 65 46 57 |ke certificateFW|
00592e10 78 30 d5 7c 98 0f 00 00 00 00 00 00 00 22 |x0.|........."|
re-uploading will result in an identical image... try gunzipping with another tool or two if your *doze tools spit the dummy... 
Thank you very much. That explains it. I used Winzip and it extracted it without any errors and now the Espressobin is booting using this image as it should 
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