[Nexus 9 Q&A, Help & Troubleshooting] 夏默秋殇:
when i reboot it , it can't open

i was unlock BootLoader，

all 7.11 system image was been recovery, not useful

reboot it

your device is it can not be trusted and may not to work properly

visit this link on an other device

g.co/ABH

press power to pause boot

ADB command code

C:\ADB>flash-all

Sending 'bootloader' (2901 KB) OKAY [ 0.212s]

Writing 'bootloader' (bootloader) Device State : Unlocked

(bootloader) zip header checking...

(bootloader) shift signature_size for header checking...

(bootloader) zip info parsing...

(bootloader) checking model ID...

(bootloader) start image[hboot] unzipping for pre-update check...

(bootloader) start image[bct] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[mts_preboot_prod] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[mts_prod] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[hboot] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[nvtboot] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[nvtbootwb0] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[tos] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[sp1] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[gp1] unzipping & flashing...

(bootloader) ...... Successful

(bootloader) start image[pt] unzipping & flashing...

(bootloader) ...... Successful

OKAY [ 5.463s]

Finished. Total time: 5.684s

rebooting into bootloader OKAY [ 0.036s]

Finished. Total time: 0.040s

< waiting for any device >

extracting android-info.txt (0 MB) to RAM...

--------------------------------------------

Bootloader Version...: 3.50.0.0143

Baseband Version.....: N/A

Serial Number........: HT4ADJT01784

--------------------------------------------

Checking product OKAY [ 0.003s]

Checking version-bootloader OKAY [ 0.004s]

extracting boot.img (8 MB) to disk... took 0.027s

archive does not contain 'boot.sig'

archive does not contain 'dtbo.img'

archive does not contain 'dt.img'

archive does not contain 'odm.img'

archive does not contain 'product.img'

extracting recovery.img (10 MB) to disk... took 0.033s

archive does not contain 'recovery.sig'

extracting system.img (1453 MB) to disk... took 8.673s

archive does not contain 'system.sig'

archive does not contain 'vbmeta.img'

extracting vendor.img (122 MB) to disk... took 0.785s

archive does not contain 'vendor.sig'

Couldn't parse erase-block-size '0xUnknown command'.

Couldn't parse logical-block-size '0xUnknown command'.

F2FS-tools: mkfs.f2fs Ver: 1.10.0 (2018-01-30)

Info: Disable heap-based policy

Info: Debug level = 0

Info: Label =

Info: Trim is disabled

Info: Segments per section = 1

Info: Sections per zone = 1

Info: sector size = 512

Info: total sectors = 53714944 (26228 MB)

Info: zone aligned segment0 blkaddr: 512

Info: add quota type = 0 => 4

Info: add quota type = 1 => 5

Info: Overprovision ratio = 1.240%

Info: Overprovision segments = 328 (GC reserved = 169)

Info: format successful

Couldn't parse erase-block-size '0xUnknown command'.

Couldn't parse logical-block-size '0xUnknown command'.

mke2fs 1.43.3 (04-Sep-2016)

Creating filesystem with 65536 4k blocks and 65536 inodes

Filesystem UUID: 177cbd32-7522-11e8-8a10-bd7422ec86f1

Superblock backups stored on blocks:

32768

Allocating group tables: done

Writing inode tables: done

Creating journal (4096 blocks): done

Writing superblocks and filesystem accounting information: done

Sending 'boot' (8636 KB) OKAY [ 0.552s]

Writing 'boot' (bootloader) Device State : Unlocked

OKAY [ 0.829s]

Sending 'recovery' (11204 KB) OKAY [ 0.662s]

Writing 'recovery' (bootloader) Device State : Unlocked

OKAY [ 0.946s]

Sending sparse 'system' 1/4 (478340 KB) OKAY [ 24.143s]

Writing sparse 'system' 1/4 (bootloader) Device State : Unlocked

OKAY [ 20.047s]

Sending sparse 'system' 2/4 (468227 KB) OKAY [ 23.647s]

Writing sparse 'system' 2/4 (bootloader) Device State : Unlocked

OKAY [ 19.934s]

Sending sparse 'system' 3/4 (499117 KB) FAILED (command write failed (Unknown error))

Finished. Total time: 108.734s

Press any key to exit...

can anybaby help me？ how to fix it？

my English not good。