I keep getting this error message on iPhone8:
"The developer needs to download an assembly that supports your device architecture (armv6)."
And the same version can be installed on other devices (iphone7,6, ipad ...).
So far i tried
upgrade your Mac to 10.12.6 and reboot
keep the whole Xcode project clean
upgrade crashlix / fabric version
try Xcode 8.3 and 9GM
And nothing works for me.

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