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I have a Samsung Galaxy S4 SGH-I337 with a I337UCUAMF3 baseband. How do I either root it and unlock the bootloader or install a mod? Alternately, can I change it back to a previous baseband and unlock the bootloader?
rooting
tag, have you followed up to our rooting index via its tag-wiki? There you can find e.g.: Galaxy S4 SCH-I545 and Galaxy S4 Mini GT-I9195.