Using AT&T S7 Edge on Cricket, need help installing OTA updates

I am using an AT&T SM-G935A on Cricket, but unsurprisingly I can't get the OTA updates to install. The phone is unlocked but not rooted. What's the best way for me to install the G935AUCU2APG1 and G935AUCS2APH1 updates without an AT&T SIM? I curently have G935AUCS2APE1. The Odin method looks promising, but I need some help in the necessary steps.

Thanks in advance.

JH

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