升6.0 开机卡在google界面

于是我回到了5.0.2然后一步步OTA上去
你猜我为什么不回到5.1.1因为找不到TGZ。。
现在在下载6.0的OTA

我第一次刷，卡在那4个球那了，类似下图。看有人说等10多分钟，不行重启，吓到了，各位看看怎么弄呀？

我的刷机日志：
E:\nexus9\test>fastboot flash bootloader bootloader-flounder-3.48.0.0135.img
target reported max download size of 518205818 bytes
sending 'bootloader' (2898 KB)...
OKAY [ 0.243s]
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 [ 5.465s]
finished. total time: 5.710s
E:\nexus9\test>fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.033s]
finished. total time: 0.034s
E:\nexus9\test>fastboot flash recovery recovery.img
target reported max download size of 518205818 bytes
sending 'recovery' (9032 KB)...
OKAY [ 0.642s]
writing 'recovery'...
(bootloader) Device State : Unlocked
OKAY [ 0.850s]
finished. total time: 1.494s
E:\nexus9\test>fastboot flash boot boot.img
target reported max download size of 518205818 bytes
sending 'boot' (8278 KB)...
OKAY [ 0.570s]
writing 'boot'...
(bootloader) Device State : Unlocked
OKAY [ 0.817s]
finished. total time: 1.389s
E:\nexus9\test>fastboot flash system system.img
target reported max download size of 518205818 bytes
erasing 'system'...
OKAY [ 1.105s]
sending sparse 'system' (499853 KB)...
OKAY [ 27.223s]
writing 'system'...
(bootloader) Device State : Unlocked
OKAY [ 19.618s]
sending sparse 'system' (495930 KB)...
OKAY [ 27.109s]
writing 'system'...
(bootloader) Device State : Unlocked
OKAY [ 20.122s]
sending sparse 'system' (495450 KB)...
OKAY [ 26.937s]
writing 'system'...
(bootloader) Device State : Unlocked
OKAY [ 19.764s]
sending sparse 'system' (443364 KB)...
OKAY [ 24.360s]
writing 'system'...
(bootloader) Device State : Unlocked
OKAY [ 19.106s]
sending sparse 'system' (310634 KB)...
OKAY [ 17.637s]
writing 'system'...
(bootloader) Device State : Unlocked
OKAY [ 12.591s]
finished. total time: 215.590s
E:\nexus9\test>fastboot flash vendor vendor.img
target reported max download size of 518205818 bytes
erasing 'vendor'...
OKAY [ 0.474s]
sending 'vendor' (134267 KB)...
OKAY [ 7.161s]
writing 'vendor'...
(bootloader) Device State : Unlocked
OKAY [ 6.035s]
finished. total time: 13.676s
E:\nexus9\test>fastboot flash cache cache.img
target reported max download size of 518205818 bytes
erasing 'cache'...
OKAY [ 0.428s]
sending 'cache' (6248 KB)...
OKAY [ 0.479s]
writing 'cache'...
(bootloader) Device State : Unlocked
OKAY [ 0.693s]
finished. total time: 1.602s
E:\nexus9\test>fastboot -w
Erase successful, but not automatically formatting.
File system type f2fs not supported.
Creating filesystem with parameters:
Size: 268435456
Block size: 4096
Blocks per group: 32768
Inodes per group: 8192
Inode size: 256
Journal blocks: 1024
Label:
Blocks: 65536
Block groups: 2
Reserved block group size: 15
Created filesystem with 11/16384 inodes and 2089/65536 blocks
error: file_write: write: Bad file descriptor
Cannot read image.
erasing 'userdata'...
OKAY [ 0.629s]
erasing 'cache'...
OKAY [ 0.431s]
finished. total time: 1.065s
E:\nexus9\test>

重刷5.1.1了，也这样，重新进入自带recover双清后好了，不知一般要等多长时间