[XCSSA] Attempting to hack a ip8100 (Cordless SIP phone)

[X-otic Computer Systems of San Antonio]

X-otic Computer Systems of San Antonio wrote:
> Hey,
>
> Maybe with all the hardware hackers on here, someone can help me out.
>
> I acquired a Vtech ip8100 voip phone thingy that's currently locked to 
> vonage. From what I've read on the internet, if I can downgrade the 
> firmware, I can use a tool called CYT tool to reset the passwords and 
> then provision it however I'd like to.
>
> Unfortunately, I'm not able to do any of the hacks, and simply sending 
> it a firmware isn't working. It won't take the downgrade.
>
> I've cracked open the box and found console pins on there, but I need a 
> serial port to TTL converter module:
> http://cgi.ebay.com/RS232-Serial-Port-To-TTL-Converter-Module-MAX3232-LED_W0QQitemZ300249101371QQcmdZViewItem
>
> I was wondering if perhaps someone had one of those I could borrow, or 
> would maybe like to help me get this working? I've got a few firmwares 
> for it, just need to get them on there. I should theoretically then be 
> able to unlock it and have myself a pair of cordless SIP phones :D
>
> Thanks,
>
> David
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>
>   
David,

I have a MAX3232 and I could make a level converter for you.
It won't be as pretty as the one on E-bay but it'll work just the 
same... ;-)
You can borrow it as long as you need it...

/Fredrik