Question
sz -vv -b helloworld.ko > /dev/ttyUSB0 < /dev/ttyUSB0
B00000000000000-/bin/sh: B00000000000000: not found# Retry 0: Got TIMEOUT
B00000000000000-/bin/sh: B00000000000000: not found# Retry 0: Got TIMEOUT
Transfer incomplete
Answer
Add LRZSZ package to defconfig