revert back to android 6.0.1 on android N

I think I've found a way to revert back to android 6.0.1, i was on android N OTA so i flash twrp and flash WETA rom, but the battery seem bad for me so i want to revert back to android N by flashing stock img using ADB, and then i got bootloop, so i reboot back into stock recovery and wipe user data and cache and reboot, and then when the phone boot up it booted android 6.0.1

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