无法使用ANDROID预览系统映像闪存Nexus 7[2012][Wifi]

我当时正试图用ANDROID预览系统映像闪存Nexus7[2012][Wifi]，该系统映像在

我一步一步地按照说明进行操作，但当我执行“flash all.sh”时，它不起作用，我在命令提示符中收到以下消息：

sending 'bootloader' (3911 KB)...
OKAY [  0.487s]
writing 'bootloader'...
FAILED (remote: (InvalidState))
finished. total time: 0.715s
rebooting into bootloader...
OKAY [  0.025s]
finished. total time: 0.075s
archive does not contain 'boot.sig'
archive does not contain 'recovery.sig'
archive does not contain 'system.sig'
archive does not contain 'vendor.img'
Creating filesystem with parameters:
    Size: 14569963520
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 8160
    Inode size: 256
    Journal blocks: 32768
    Label: 
    Blocks: 3557120
    Block groups: 109
    Reserved block group size: 871
Created filesystem with 11/889440 inodes and 97309/3557120 blocks
Creating filesystem with parameters:
    Size: 464519168
    Block size: 4096
    Blocks per group: 32768
    Inodes per group: 7088
    Inode size: 256
    Journal blocks: 1772
    Label: 
    Blocks: 113408
    Block groups: 4
    Reserved block group size: 31
Created filesystem with 11/28352 inodes and 3654/113408 blocks
--------------------------------------------
Bootloader Version...: 4.23
Baseband Version.....: N/A
Serial Number........: 015d49060618000a
--------------------------------------------
checking product...
FAILED

Device product is 'grouper'.
Update requires 'flo'.

finished. total time: 0.168s

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此图像仅适用于Nexus 7[2013]（Wi-Fi）。

从以下位置安装Nexus 7 2012（Wi-Fi）的最后一个kitkat映像：

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此图像仅适用于Nexus 7[2013]（Wi-Fi）。

从以下位置安装Nexus 7 2012（Wi-Fi）的最后一个kitkat映像：

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该图像是2013版平板电脑的图像。我在哪里可以找到2012版的图像？至少该图像是2013版平板电脑的图像。我在哪里可以找到2012年的图像？至少kitkatI对Nexus 7（Wi-Fi）使用了“nakasi”我对Nexus 7（Wi-Fi）使用了“nakasi”