Wait a minute. Black colored XL model?
"the serial number starts with GH"
My bad. I saw only the "G" when I read that. The OLD OLD ONE serials started with "G" and then numerics.
What you have (which is evident now that I read "GH" - what you typed!) is known as an XL IQRoutes² with text-to-speech ability, or an XL250. I think only the folks in Australia and New Zealand call it an XL250. To you, it would be an XL IQRoutes² with text to speech.
OK. The IQRoutes '2' models
were a bit dumbed down from the original XL IQRoutes models. Those models were also known here in the U.S. as the XL 340 models. There was a lot of complaint when these units came out because they WERE missing quite a number of features from the earlier IQRoutes model. There was a bit of an uproar about that here at the time, and a lot of folks returned them when they realized that the entire menu system was lacking all kinds of things to which they had become accustomed.
Here's just one of the old threads covering the issue >>
https://www.tomtomforums.com/threads/tomtom-start2-problems.23662/