Installing Custom Recovery (Gen 2 Only)

About

This custom recovery currently exploits a secure boot flaw in the second generation of Google TV devices to allow booting an unsigned kernel on the Google TV. Below we allow users to install a custom recovery on the Google TV which allows full read write access to the device as well as an automated process for installing updates (of which we do not check the signature.)

Devices

• ASUS Cube
• Hisense Pulse
• Sony NSZ-GS7/GS8

Warnings

• This will definitely void your warranty, if you want to keep your warranty please do not do any of the steps in this guide.
• This may brick your GTV. It shouldn't, but it still might!

Tools Needed

• Linux Live CD or Linux Installed
• A vulnerable Google TV device.
• 1 USB Drive (to be formatted)

Pre-Setup

1. Boot Linux (Live CD or Install)
2. Download Custom Recovery Package for Device
3. Unzip Custom Recovery Package

Custom Recovery Steps (Cube and Pulse)

1. Format a drive NTFS, and mount it.
2. cd to the drive, and issue the following commands:

   The major and minor hash for these commands is pulled from an "ls -l" on /dev/mtd for the recovery mtd.

   mknod gtvhacker-recovery c 90 32

3. Then, copy over our files for your specific box, to the root of your NTFS flash drive

   nandwrite

   flash_erase

   CustomRecovery-VENDOR-MODEL-GTVHACKER.bin

4. Unmount the drive, and insert it into your Google TV.
5. Connect via adb, and issue the shell command.
6. To find out what USB drive you plugged in, issue this command:

   ls /mnt/media/

   cd /mnt/media/usb.LABEL (where label = the rest from above)

7. Now, issue these commands:

   cp flash_erase /data/local/tmp

   cp nandwrite /data/local/tmp

   chmod 755 /data/local/tmp/flash_erase

   chmod 755 /data/local/tmp/nandwrite

   cd /data/local/tmp

8. Finally, to install the recovery (where usb.LABEL is the name of your usb drive from above):

   ./flash_erase /mnt/media/usb.LABEL/gtvhacker-recovery 0 0

   ./nandwrite -p /mnt/media/usb.LABEL/gtvhacker-recovery /mnt/media/usb.LABEL/CustomRecovery-VENDOR-MODEL-GTVHACKER.bin

9. Issue an adb reboot, and you have a custom recovery.

Developers Only (CUBE, PULSE) (UART console required)

We are preparing a update package to be installed from the recovery GUI which will automate the custom bootloader install. To install the uboot custom bootloader (developers only, UART console required):

1. Format a drive NTFS, and mount it.
2. cd to the drive, and issue the following commands:

   The major and minor hash for these commands is pulled from an "ls -l" on /dev/mtd for the kernel mtd.

   mknod gtvhacker-kernel c 90 16

3. Then, copy over our files for your specific box, to the root of your NTFS flash drive

   nandwrite

   flash_erase

   uboot-VENDOR-MODEL-GTVHACKER.bin

4. Unmount the drive, and insert it into your Google TV.
5. Connect via adb, and issue the shell command.
6. To find out what USB drive you plugged in, issue this command:

   ls /mnt/media/

   cd /mnt/media/usb.LABEL (where label = the rest from above)

7. Now, issue these commands:

   cp flash_erase /data/local/tmp

   cp nandwrite /data/local/tmp

   chmod 755 /data/local/tmp/flash_erase

   chmod 755 /data/local/tmp/nandwrite

   cd /data/local/tmp

8. Finally, to install the custom bootloader (where usb.LABEL is the name of your usb drive from above):

   ./flash_erase /mnt/media/usb.LABEL/gtvhacker-kernel 0 0

   ./nandwrite -p /mnt/media/usb.LABEL/gtvhacker-mtd8 /mnt/media/usb-LABEL/uboot-VENDOR-MODEL-GTVHACKER.bin

9. Issue an adb reboot, and you have a custom DEVELOPER ONLY bootloader.

• To then boot from USB (try other ports if its not detected):

usb start; fatload usb 0:1 0x01308000 zImage 20568700; go 0x01308000 

0x01308000 is the load address, zImage is the name of the file on a vfat formatted USB drive, and 20568700 is it's filesize

Custom Recovery Steps (Sony)

1. Format a drive NTFS, and mount it.
2. cd to the drive, and issue the following commands:

   The major and minor hash for these commands is pulled from an "ls -l" on /dev/block for the recovery block.

   mknod gtvhacker-recovery b 179 10

3. Then, copy over our files for your specific box, to the root of your NTFS flash drive

   CustomRecovery-VENDOR-MODEL-GTVHACKER.bin

4. Unmount the drive, and insert it into your Google TV.
5. Connect via adb, and issue the shell command.
6. To find out what USB drive you plugged in, issue this command:

   ls /mnt/media/

   cd /mnt/media/usb.LABEL (where label = the rest from above)

7. Install the recovery (where usb.LABEL is the name of your usb drive from above):

   cp /mnt/media/usb.LABEL/CustomRecovery-VENDOR-MODEL-GTVHACKER.bin /mnt/media/usb.LABEL/gtvhacker-recovery

8. Issue an adb reboot, and you have a custom recovery.

Developers Only (SONY) (UART console required)

We are preparing a update package to be installed from the recovery GUI which will automate the custom bootloader install. To install the uboot custom bootloader (developers only, UART console required):

1. Format a drive NTFS, and mount it.
2. cd to the drive, and issue the following commands:

   The major and minor hash for these commands is pulled from an "ls -l" on /dev/mtd for the kernel mtd.

   mknod gtvhacker-kernel b 179 7

3. Then, copy over our files for your specific box, to the root of your NTFS flash drive

   uboot-VENDOR-MODEL-GTVHACKER.bin

4. Unmount the drive, and insert it into your Google TV.
5. Connect via adb, and issue the shell command.
6. Install the custom bootloader (where usb.LABEL is the name of your usb drive from above):

   cd /data/local/tmp

   cp /mnt/media/usb-LABEL/uboot-VENDOR-MODEL-GTVHACKER.bin /mnt/media/usb.LABEL/gtvhacker-mtd8

7. Issue an adb reboot, and you have a custom DEVELOPER ONLY bootloader.

• To then boot from USB (try other ports if its not detected):

usb start; fatload usb 0:1 0x01308000 zImage 20568700; go 0x01308000 

0x01308000 is the load address, zImage is the name of the file on a vfat formatted USB drive, and 20568700 is it's filesize

Troubleshooting

• You can get help from us or other users at:

GTVHacker Forums

GTVHacker Wiki

• or you can chat with us on IRC at:

irc.freenode.net #gtvhacker

Freenode Webchat

(Someone may not be around right away to help, make sure to be willing to wait for a response)

Download

Custom Recovery:

• Asus Cube Recovery
• Hisense Pulse Recovery
• Sony NSZ-GS7 and NSZ-GS8