Downloadthe Lineage OS 15.1 for Oppo Find 7/7a and move the flashable zip file which you downloaded from above. Now boot into TWRP Recovery, Here is the method to boot into Recovery. Before installing Wipe System Data on TWRP Recovery (DO NOT WIPE INTERNAL STORAGE) Guide to Flash Custom ROM using TWRP Recovery.
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oppo find 7 custom rom
