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SPA303 and SPA504 phones locked with unknown admin passwords

Hi

I have inherited a number of SPA303 and SPA504 phones that are locked with unknown user AND admin passwords.

The phones were not on the current network, so do not have the original provisioning data or anything. 

All I want to do is get these phones reset to factory default to redeploy them.  But trying to log on via the IP address or use the phone menu itself requires an admin password (which I do not know).

Googling the issue seems to suggest that there is NO possible way of resetting/unlocking the phones, is this the case, is there no way to reset them to factory without the admin password?  Surely in 2016, someone has worked out how to push a factory reset through?

When the Firmware upgrade spa50x-30x-7-5-2b.exe is run, it states the following:

This SPA requires a password in order to be
upgraded. If you do not have administrator's
privileges for this unit, please contact your
Service Provider or network administrator,
before proceeding.

You must provide the SPA administrator's
password to upgrade. If you are the administrator
and forgot the password, you may perform a
factory reset by entering * * * *, option 73738#,
and value 1 from a telephone connected to the
unit to be upgraded.

* * * * * * * * * * *  Warning  * * * * * * * * * * *
All settings will revert to default values
after factory reset!  You may not be able to
reestablish service after completing this upgrade
without first reentering service configuration
information.

(I have bolded the important paragraph)

But that doesn't seem to do anything at all... on the locked handset I have tried dialling " **** 73738# " but nothing happens.

Does anyone have any further suggestions please?  I am not bothered about recovering the existing password and profile, I just want to reset back to factory spec and start again.

Thanks

David

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