Samsung SGH-i337 (AT&T) Can't flash ROM/Recovery Protection error

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I have a Samsung Galaxy S4 from AT&T that I recently "upgraded" to an LG K10 (Not really an upgrade in my opition as I actually liked the Samsung better) Anyway the Samsung S4 is totally free and clear (IE: Clean IMEI, ESN and paid for so the phone is now rightfully mine and not attached to any account)

Anyway I am trying to flash a new recovery (TWRP) using ODIN and I keep getting an error about some kind of bootloader code protection. I don't want to use this as a phone anymore I just want to use it as a music/media player

Can the problem be something I am doing or is the recovery partition in fact protected?

Thanks!

PS: I really want to do this so I can upgrade to a new version of Android on this device

 

[Deleted member 245375]

Might find a lot more info and potential help over at the Galaxy S4 subforum at XDA (and there's a sub-subforum just for the AT&T variant there as well):

https://forum.xda-developers.com/galaxy-s4