[Nexus 7 Q&A, Help & Troubleshooting] j576:
Help...

I think I have the same problem as some members do...I ran through the steps and the device is still stuck at Google screen

I am working on a Win7 laptop, so I assume all of the USB port should be connect to the motherboard, right?

Anyway, I tried them...

Mine is a Nexus 7, 32 GB, WIFI, JOP40D

I was trying to install GemRB and play IWD.

I did the install, started to copy the game file to N7, then I went out.

When I came home, my laptop said it is not able to copy a file to N7, so I told it to skip and copy another one, then the same message appeared.

Then I realized the N7 was off, so I plug it to the charger thinking it may ran out of battery (which shouldn't be, I think...)

After a while, I tried to turn it on, then it was in bootloop...

So I tried to rescue it with Tug's toolkit... it works... but then N7 stuck to Google screen rather than bootloop...

My N7 was unlock, so I follow all of the command after fastboot oem unlock, but I did try starting with unlock, with no different result....

following is the copy of my cmd prompt

########################################################################

Microsoft Windows [Version 6.1.7601]

Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\D>cd c:\android-sdk

c:\android-sdk>cd platform-tools

c:\android-sdk\platform-tools>adb

Android Debug Bridge version 1.0.29

-d - directs command to the only connected USB devic

e

returns an error if more than one USB device is

present.

-e - directs command to the only running emulator.

returns an error if more than one emulator is r

unning.

-s <serial number> - directs command to the USB device or emulator w

ith

the given serial number. Overrides ANDROID_SERI

AL

environment variable.

-p <product name or path> - simple product name like 'sooner', or

a relative/absolute path to a product

out directory like 'out/target/product/sooner'.

If -p is not specified, the ANDROID_PRODUCT_OUT

environment variable is used, which must

be an absolute path.

devices - list all connected devices

connect <host>[:<port>] - connect to a device via TCP/IP

Port 5555 is used by default if no port number

is specified.

disconnect [<host>[:<port>]] - disconnect from a TCP/IP device.

Port 5555 is used by default if no port number

is specified.

Using this command with no additional arguments

will disconnect from all connected TCP/IP devic

es.

device commands:

adb push <local> <remote> - copy file/dir to device

adb pull <remote> [<local>] - copy file/dir from device

adb sync [ <directory> ] - copy host->device only if changed

(-l means list but don't copy)

(see 'adb help all')

adb shell - run remote shell interactively

adb shell <command> - run remote shell command

adb emu <command> - run emulator console command

adb logcat [ <filter-spec> ] - View device log

adb forward <local> <remote> - forward socket connections

forward specs are one of:

tcp:<port>

localabstract:<unix domain socket name>

localreserved:<unix domain socket name>

localfilesystem:<unix domain socket name>

dev:<character device name>

jdwp:<process pid> (remote only)

adb jdwp - list PIDs of processes hosting a JDWP transport

adb install [-l] [-r] [-s] [--algo <algorithm name> --key <hex-encoded key> --

iv <hex-encoded iv>] <file>

- push this package file to the device and instal

l it

('-l' means forward-lock the app)

('-r' means reinstall the app, keeping its data

)

('-s' means install on SD card instead of inter

nal storage)

('--algo', '--key', and '--iv' mean the file is

encrypted already)

adb uninstall [-k] <package> - remove this app package from the device

('-k' means keep the data and cache directories

)

adb bugreport - return all information from the device

that should be included in a bug report.

adb backup [-f <file>] [-apk|-noapk] [-shared|-noshared] [-all] [-system|-nosy

stem] [<packages...>]

- write an archive of the device's data to <file>

.

If no -f option is supplied then the data is wr

itten

to "backup.ab" in the current directory.

(-apk|-noapk enable/disable backup of the .apks

themselves

in the archive; the default is noapk.)

(-shared|-noshared enable/disable backup of the

device's

shared storage / SD card contents; the defau

lt is noshared.)

(-all means to back up all installed applicatio

ns)

(-system|-nosystem toggles whether -all automat

ically includes

system applications; the default is to inclu

de system apps)

(<packages...> is the list of applications to b

e backed up. If

the -all or -shared flags are passed, then t

he package

list is optional. Applications explicitly g

iven on the

command line will be included even if -nosys

tem would

ordinarily cause them to be omitted.)

adb restore <file> - restore device contents from the <file> backup

archive

adb help - show this help message

adb version - show version num

scripting:

adb wait-for-device - block until device is online

adb start-server - ensure that there is a server running

adb kill-server - kill the server if it is running

adb get-state - prints: offline | bootloader | device

adb get-serialno - prints: <serial-number>

adb status-window - continuously print device status for a specifie

d device

adb remount - remounts the /system partition on the device re

ad-write

adb reboot [bootloader|recovery] - reboots the device, optionally into the boo

tloader or recovery program

adb reboot-bootloader - reboots the device into the bootloader

adb root - restarts the adbd daemon with root permissions

adb usb - restarts the adbd daemon listening on USB

adb tcpip <port> - restarts the adbd daemon listening on TCP on th

e specified port

networking:

adb ppp <tty> [parameters] - Run PPP over USB.

Note: you should not automatically start a PPP connection.

<tty> refers to the tty for PPP stream. Eg. dev:/dev/omap_csmi_tty1

[parameters] - Eg. defaultroute debug dump local notty usepeerdns

adb sync notes: adb sync [ <directory> ]

<localdir> can be interpreted in several ways:

- If <directory> is not specified, both /system and /data partitions will be u

pdated.

- If it is "system" or "data", only the corresponding partition

is updated.

environmental variables:

ADB_TRACE - Print debug information. A comma separated list

of the following values

1 or all, adb, sockets, packets, rwx, usb, sync

, sysdeps, transport, jdwp

ANDROID_SERIAL - The serial number to connect to. -s takes prior

ity over this if given.

ANDROID_LOG_TAGS - When used with the logcat option, only these de

bug tags are printed.

c:\android-sdk\platform-tools>fastboot reboot-bootloader

rebooting into bootloader...

OKAY [ 0.020s]

finished. total time: 0.022s

c:\android-sdk\platform-tools>fastboot erase boot

erasing 'boot'...

OKAY [ 0.135s]

finished. total time: 0.139s

c:\android-sdk\platform-tools>fastboot erase cache

erasing 'cache'...

OKAY [ 0.234s]

finished. total time: 0.238s

c:\android-sdk\platform-tools>fastboot erase recovery

erasing 'recovery'...

OKAY [ 0.136s]

finished. total time: 0.140s

c:\android-sdk\platform-tools>fastboot erase system

erasing 'system'...

OKAY [ 0.390s]

finished. total time: 0.394s

c:\android-sdk\platform-tools>fastboot erase userdata

erasing 'userdata'...

OKAY [ 7.575s]

finished. total time: 7.579s

c:\android-sdk\platform-tools>fastboot flash bootloader bootloader-grouper-4.13.

img

sending 'bootloader' (2096 KB)...

OKAY [ 0.288s]

writing 'bootloader'...

OKAY [ 1.947s]

finished. total time: 2.239s

c:\android-sdk\platform-tools>fastboot reboot-bootloader

rebooting into bootloader...

OKAY [ 0.020s]

finished. total time: 0.023s

c:\android-sdk\platform-tools>fastboot -w update image-nakasi-jop40d.zip

archive does not contain 'boot.sig'

archive does not contain 'recovery.sig'

archive does not contain 'system.sig'

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

Bootloader Version...: 4.13

Baseband Version.....: N/A

Serial Number........: 015d2ea4cf2ff00a

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

checking product...

OKAY [ 0.030s]

checking version-bootloader...

OKAY [ 0.019s]

sending 'boot' (4942 KB)...

OKAY [ 0.676s]

writing 'boot'...

OKAY [ 0.546s]

sending 'recovery' (5444 KB)...

OKAY [ 0.764s]

writing 'recovery'...

OKAY [ 0.435s]

sending 'system' (477136 KB)...

OKAY [ 64.123s]

writing 'system'...

OKAY [ 27.185s]

erasing 'userdata'...

OKAY [ 4.949s]

formatting 'userdata' partition...

Creating filesystem with parameters:

Size: 30080499712

Block size: 4096

Blocks per group: 32768

Inodes per group: 8160

Inode size: 256

Journal blocks: 32768

Label:

Blocks: 7343872

Block groups: 225

Reserved block group size: 1024

Created filesystem with 11/1836000 inodes and 159268/7343872 blocks

sending 'userdata' (139157 KB)...

writing 'userdata'...

OKAY [ 32.670s]

erasing 'cache'...

OKAY [ 0.202s]

formatting 'cache' partition...

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

sending 'cache' (9052 KB)...

writing 'cache'...

OKAY [ 2.393s]

rebooting...

finished. total time: 134.176s

c:\android-sdk\platform-tools>

#################################################################

Can somebody help...?

or should I just try to lock it again and tell Acer it stuck and ask for a new one...?

and I wonder if it is because of those .sig that I am missing?

What are those?

Thanks in advance