I bought recently one Blaupunkt TrvelPilot 300.
I know it´s not new device, but for me is ok.
I´ve been looking by the forum, but didn´t find how update maps.
My current version is sd2-WEUR_TP300_2008 v1
AFAIK there are new updates for this system..Your better option is to unlock it and run iGO8 with the lastest maps (Navteq 2013.Q3 for eg.)
First step is to enter core WinCe. You can make by pressing "-" and "+" buttons while the system starts up (You have to press them at the same time just after reset) and this will lead you to WinCe from where you can start desired navigation software (I suggest iGO8)
launching from SD card: Copy iGO8 with your preferred maps on a SD card, than enter wince desktop like described above, than open file "My Device -> SD card -> iGO8-> iGO8.exe" and iGO8 should start.
If You want to use original Menu (Shell) and startup Blaupunkt normally (without "unlocking") all You have to do is to change the name of file executing original navigating program or better change the name of file for photoviewer or audioplayer (EagleAudio.exe or DNPicViewer.exe respectively).