21:50:17.206 B9L l1x: waiting for lk1st fastboot <EMMC_SERIAL> (power off >= 90 s, then RESET held + battery -> USB)
21:50:17.221 fastboot present: product=lk2nd-msm8916
Sending 'boot.img' (292 KB)                        OKAY [  0.012s]
Booting                                            OKAY [  0.023s]
Finished. Total time: 0.036s
rc=0
21:50:17.262 waiting for second-stage fastboot (or Linux NCM)
21:50:17.280 fastboot present again: product= version-bootloader=
21:50:20.284 B9L l1x END