Continuing the discussion from ZTE - Axon 7 - axon7 - Documentation Suggestions:
…Enter suggestions to improve documentation in this category. Do not raise bugs or issues here…
Hi @juckendesAuge welcome to the /e/ forum.
I have started a new topic due to the advice in the #ewiki:documentation-suggestions threads not to raise issues there !
I do not know this device but Error 7 is often associated with an attempt to downgrade Android version. So an Error 7 might happen when one attempts to Install /e/ Nougat on a device already running Android Oreo.
In case of difficulty one might compare your “starting point” with this advice
Caution: Do not install /e/OS on top of a higher version of stock OS. Before installing /e/OS ensure your device has the latest stock OS of the same version as /e/OS. If only lower versions of the stock are available then install the last available lower version before installing /e/OS.