Flash Stock + Unroot...
------------------------------------------------------------------
erasing 'boot'...
OKAY [ 0.024s]
finished. total time: 0.025s
******** Did you mean to fastboot format this partition?
erasing 'cache'...
OKAY [ 0.090s]
finished. total time: 0.090s
erasing 'recovery'...
OKAY [ 0.025s]
finished. total time: 0.025s
******** Did you mean to fastboot format this partition?
erasing 'system'...
OKAY [ 0.116s]
finished. total time: 0.116s
******** Did you mean to fastboot format this partition?
erasing 'userdata'...
OKAY [ 4.941s]
finished. total time: 4.941s
sending 'bootloader' (3911 KB)...
OKAY [ 0.487s]
writing 'bootloader'...
FAILED (remote: (InvalidState))
finished. total time: 0.724s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
sending 'radio' (16384 KB)...
OKAY [ 1.971s]
writing 'radio'...
OKAY [ 1.757s]
finished. total time: 3.728s
rebooting into bootloader...
OKAY [ 0.020s]
finished. total time: 0.020s
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
--------------------------------------------
Bootloader Version...: 4.18
Baseband Version.....: 1231_0.18.0_0409
Serial Number........: 015d41d859481419
--------------------------------------------
checking product...
OKAY [ 0.040s]
checking version-bootloader...
FAILED
Device version-bootloader is '4.18'.
Update requires '4.23'.
finished. total time: 0.200s