[Q] ODIN fails while installing TWRP, stuck at boot

I was trying to upgrade from CM11 to CM12, which went smooth except for GAPPS closing constantly. I read online that this was caused by an old version of the recovery, so I tried to update TWRP to 2.8.4.0. I first tried using the TWRP app from the Play Store (after recovering my Nandroid backup), which locked the phone where it would only try booting into recovery, but couldn't get there. Holding the power button to turn it off would result in a reboot right back into recovery, which of course never went anywhere. Now I am trying to re-install TWRP using ODIN but It fails every time [Complete(Write) operation failed.] I have an early S4 from AT&T and it has never had an official update. I can't remember which firmware it is using, but it is the original so I shouldn't have any problems there. Can anybody help me get this thing up and running with either TWRP or CWM and CM12 please?!

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