Thanks to visit codestin.com
Credit goes to tudbut.de
EZDTU mirror and docs
EZDTU is the test and config software for EZDTU LTE modules like the very cheap FS800E. It is sadly extremely hard to find a download link for it, so I am providing one here for future adventurers:
"Official" link
My mirror
Docs
I also got a hold of some documentation, although it's all translations with a few errors:
Summary Datasheet (MediaFire DOCX original)
AT commands and initialization (MediaFire DOCX original)
Testing using EZDTU (MediaFire DOCX original)
Summary Datasheet (My PDF mirror)
AT commands and initialization (My PDF mirror)
Testing using EZDTU (My PDF mirror)