In case of machine hanging with two fins while firmware upgrade with USB memory - try to rename two files on your USB memory FW0002 folder:
- initramfs.gz.uboot to initra~1.ubo
and
- mb86s73eb.dtb to mb86s7~1.dtb
- initramfs.gz.uboot to initra~1.ubo
and
- mb86s73eb.dtb to mb86s7~1.dtb
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