this is a crosspost to https://forum.openwrt.org/t/glinet-gl-x750-new-version/45245
"I got glinet_gl-x750, the sticker on the back of the device says “X750C4” and there is a FCC from 2019-06-19
Flashing Openwrt or LTE Openwrt (rooter) GoldenOrb is not possible
(“Device gl-x750 not supported by this image
Supported devices: glinet,gl-x750”)
I was brave and tried sysupgrade -F (force) but it (luckily?) did not work.
Any idea? I would be glad to help with further information."