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Vonage/Grandstream HT802 Factory Unlock
WARNING: This is an advanced topic and will void your
warranty! Neither SDF, the authors, contributors or sources linked within this
file will be liable for your own actions. Proceed with caution!
WARNING 2: This page is provided for information only.
Under no circumstances should these instructions be used for any illegal
purpose or in violation of any contract or user agreement.
Vonage branded models of the Grandstream HT802 come loaded with a
factory-locked firmware which does not allow for user configuration. These
models will not permit admin login with the standard Grandstream default login
of admin/admin. Removing the Vonage settings will require the following tools
and abilities:
- A philips-head screwdriver
- A computer with a USB port
- A USB-Serial adapter such as a PL2303 or FTDI and male jumper wires
- Terminal software cabaple of interacting with a serial console (screen
or minicom)
- Basic hardware hacking knowledge (think raspberry pi GPIO)
- Common sense
- An adventurous spirit
Step one: Disassembly and mainboard access
- Puncture or remove the sticker on the bottom of the device that says
"Warranty void if removed". WARNING: This will void your warranty
- Use a philips-head screwdriver to remove the single screw in the center
of the bottom of the case
- Carefully unclip and remove the top of the case. The clips are very
secure, and may require some gentle force to remove.
- The devices mainboard should now be exposed, you will see the
components, including the serial headers labelled below:
Image courtesy of
dslreports.com user toro
Step two: Connect to the serial terminal
Step three: Apply unlock and flash firmware
- Wait for the device to finish boothing. Once it is complete, you should
see a root command prompt, indicated by the '#' character.
- Type the following commands, in order. If at any point you recieve an
error, stop, and carefully check your work.
cd /tmp
dd if=/dev/mtd1 of=/tmp/fact-old.img
wget http://shriver.sdf.org/misc/ht802unlock
chmod +x ht802unlock
./ht802unlock
flash_erase /dev/mtd1
cat /tmp/fact-new.img > /dev/mtd1
flash_eraseall /dev/mtd2
Note: the ht802unlock file is a small program that reads the file
fact-old.img and creates a fact-new.img with the Vonage settings
removed.
At this point you may wish to pause and backup the two files
fact-old.img and fact-new.img. Having these will allow you to restore to
the factory firmware. You can save these files by doing the
following:
Finally, reboot the device:reboot -f
When your HT802 reboots, you will be able to access the web interface using
the device's ip address. The default login admin/admin will allow you to
configure the device without factory restrictions.
These instructions have been adapted from this
post on dslreports.com
$Id: ht802_factory_unlock.html,v 1.1 2022/01/29 22:16:25 shriver Exp $
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