Bootloader: Easy. Download bootloader 5.5022 or 5.5128 (recommended) and place it on either the internal memory of the one XL or on a small (<2GB) SD card. Reboot your Tomtom and let it update its bootloader automatically.
Originally Posted by chas521
You can download it from many sources, but I would advise to download it from Tomtom directly. Since they do not offer bootloaders separatately, download the cab for navcore 8.412 which contains bootloader 5.5128:
Open this cab and copy the file SYSTEM (Not TTSYSTEM) to your tomtom. This is the file which will write the new bootloader into the EPROM once restarted. Ensure that the battery of your Tomtom is fully charged before doing this.
Other issue, TTS on 8.010: There are probably ways that tomtom has prevented this, but nothing stops you from using SE Navcore 8.417 or SE 8.562 which are patched in all ways. They will even be snappier than 9.026 since your Tomtom has only 32 MB and 266 MHz of CPU.
One more thing: a 4GB SD card is not really standard and it might be possible that it does not work even after the bootloader upgrade. 4 GB and bigger cards should always be SDHC spec. Simple SD cards officially go up to 2 GB.
Get a Class4 or Class6 card for proper performance.