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Cosmic Ray

SM-N950U for AT&T never received 9.0 Update. Need to update to sell it.

So it's been over a year now & my AT&T SM-N950USQS5CRL1 has not received the 9.0 update.  AT&T tells me it's Samsungs fault & Samsung says it's an AT&T issue.  I don't care who's to blame, I'd just like to get it updated so I can get rid of it.  Everyone tells me how easy ODIN is but I can't figure out which firmware file to use and I'm nervous about losing what's on the phone.  The other carriers are labeled and make it easy, but of course AT&T being as bad as it is doesn't do that.  I'd love for someone to walk me through it... please.