Originally Posted by haruryu
if you unlock your bootloader you can permroot your stock rom,
Since OP has custom recovery, they must have unlocked the bootloader.
My advice to the OP, since you are already bootloader unlocked, custom recovery, and root; just flash a stock rooted or custom ROM based on the updated software. Going back to a stock is a step backwards at this point, not forwards.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)