What thenaut said. Also if you are on TWRP (maybe others too) then you can use adb sideload to flash if you don't have the ZIP on the device anymore. Let me know if you are still having issues. You can PM me. ;)
EDIT: Also I think I may have my...
S-off allows you to flash almost everything on the DNA , and with it you don't need to flash boot.img via fastboot... And why worry about OEM OTA's, devs here will make a flashable Rom with the ota
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