Hello,

I need to downgrade 2 Nexus devices to previous Android versions for 
testing purposes. I have both Nexus 7 first and second generation devices 
and I have been able to successfully downgrade first generation devices to 
Android 4.3 but I am completely unable to do the same with the Nexus 7 2013 
device.

I am downloading the images and following the instructions 
at https://developers.google.com/android/nexus/images?hl=en. I have tried 
using the two different Android 4.3 images available for the Nexus 7 2013 
wifi device. Every time I flash de device, there are no errors on the 
console (copied below) but when the device reboots, it gets to the Android 
device with a warning sign on it screen and does not boot. I am able to 
restore to Android 5.1.1 using a different image and following the same 
steps.

Please help!

Thank you very much in advance!

Regards,
Iker

Console output:

sending 'bootloader' (3911 KB)...

OKAY [  0.129s]

writing 'bootloader'...

OKAY [  1.311s]

finished. total time: 1.440s

rebooting into bootloader...

OKAY [  0.006s]

finished. total time: 0.006s

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: 13342060544

    Block size: 4096

    Blocks per group: 32768

    Inodes per group: 8144

    Inode size: 256

    Journal blocks: 32768

    Label: 

    Blocks: 3257339

    Block groups: 100

    Reserved block group size: 799

Created filesystem with 11/814400 inodes and 91881/3257339 blocks

Creating filesystem with parameters:

    Size: 587202560

    Block size: 4096

    Blocks per group: 32768

    Inodes per group: 7168

    Inode size: 256

    Journal blocks: 2240

    Label: 

    Blocks: 143360

    Block groups: 5

    Reserved block group size: 39

Created filesystem with 11/35840 inodes and 4616/143360 blocks

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

Bootloader Version...: FLO-03.15

Baseband Version.....: none

Serial Number........: 0a6a1f64

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

checking product...

OKAY [  0.003s]

checking version-bootloader...

OKAY [  0.004s]

sending 'boot' (6880 KB)...

OKAY [  0.223s]

writing 'boot'...

OKAY [  0.255s]

sending 'recovery' (7424 KB)...

OKAY [  0.240s]

writing 'recovery'...

OKAY [  0.284s]

erasing 'system'...

OKAY [  0.238s]

sending 'system' (603447 KB)...

OKAY [ 19.037s]

writing 'system'...

OKAY [ 25.838s]

erasing 'userdata'...

OKAY [  0.466s]

sending 'userdata' (137198 KB)...

OKAY [  4.339s]

writing 'userdata'...

OKAY [  5.479s]

erasing 'cache'...

OKAY [  0.027s]

sending 'cache' (10984 KB)...

OKAY [  0.354s]

writing 'cache'...

OKAY [  0.483s]

rebooting...


finished. total time: 57.288s



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