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So I was working on backing up my phone after installing TWRP so that I could restore it if it had an issue, but it had an issue. It thinks its decrypted and I can't get it to boot, wiping does seemingly nothing.

My next step to troubleshoot is to reflash a stock ROM, but here's the thing: I bought my phone unlocked with no carrier.

$ fastboot getvar product
product: james

According to the fastboot menu, I have the XT1921-2, which according to Motorola's documentation, is the Cricket Wireless variant, which seems to have ROMs here: https://mirrors.lolinet.com/firmware/moto/james/official/Cricket/

I don't want the Cricket Wireless ROM, and my device is not subsidized (as indicated by the filenames), it's wholly owned and hasn't ever really been used to connect to a network. Which ROM am I supposed to use to restore my device?

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I've figured it out. Besides the carrier-specific ROMs, Motorola has a "retail channel", called RETUS (Retail - US, I believe).

This is not tied to any carrier, and you can match the factory version by comparing with what you get here:

# fastboot getvar ro.build.fingerprint
(bootloader) ro.build.fingerprint[0]: motorola/james/james:8.0.0/OPP27.9
(bootloader) ro.build.fingerprint[1]: 1-121/42:user/release-keys

Combine the two lines, and we have

motorola/james/james:8.0.0/OPP27.91-121/42:user/release-keys

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