How to downgrade from 1.5.1 to previous version?

Help Fairphone 2
1

Want to change to Fairphone Open OS but updated to 1.5.1. How can I downgrade to previous version? Want to use my phone from now on (not waiting for Open OS 16.07.).

Thanks in advance.
Nailix

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2 posts were merged into an existing topic: Can’t install Fairphone open OS after updating to 1.5.1 OS