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I got into U-Boot shell by typing many times CTRL C, 1, 2, enter, escape and other characters into uart while it was listening for power key presses to enter FEL. In shell there was a bunch of interrupts. There is USB Mass Storage some command that does it only for boot partition. Also do not use mmc command, emmc works but if you use mmc command it will stop, you can use fatload, fatls and probably more.
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