It's totaly impossible to change this Bootloader, it's special created by TomTom due to some hardware problems with this device
Not realy honest from the TomTom Company
But it must be still possible to install new maps, try to install Navcore 9.510 for 32MB devices
viewtopic.php?f=124&t=12862Or use maps which are supported by your Navcore version 1005_8767, 8768, 8769, 8819, 8821 when map and meta available