Ubiquiti Edgerouter X: Unable to create initramfs-factory.tar

Thank you for your update. But it didn't work for me either or maybe I got something wrong.
putty_LBRL2phcIM
EdgeOS was v1.10.7

What worked for me was flashing the "openwrt-ramips-mt7621-ubnt-erx-initramfs-factory.tar" from this german wiki:
https://wiki.opennet-initiative.de/wiki/Ubiquiti_EdgeRouter
After that I could flash the sysupgrade file from the official OpenWRT wiki.

OpenWRT 18.06.2 @ ER-X

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