I have the same problem when using this .bin. I can flash by wire the Tasmota-FW but not back to the original FW. Is there a well known way to do this?
This firmware is version 1.8.0. You need to upgrade to 1.8.2 first, then 1.8.3 and then 1.8.4 using this website: https://shelly-forum.com/index.php?shelly-firmware-archive/. It should work. If you upgrade from 1.8.0 to 1.8.4 directly, then you have this problem showing the index page.
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