21:42:33.413 B9L l0: waiting for lk1st fastboot <EMMC_SERIAL> (power off >= 90 s, then RESET held + battery -> USB)
21:43:33.792 fastboot present: product=lk1st-msm8916
Sending 'boot.img' (284 KB)                        OKAY [  0.011s]
Booting                                            OKAY [  0.022s]
Finished. Total time: 0.034s
rc=0
21:43:33.831 waiting for second-stage fastboot (or Linux NCM)
21:43:33.845 fastboot present again: product= version-bootloader=
21:43:36.849 B9L l0 END
product: lk2nd-msm8916
version-bootloader: 
kernel: lk