Problem Installing 9.510 on TomTom One XL

I'm trying to install the Navcore 9.510 on my mates TomTom One XL....I have put it on the internal memory.....The latest UK map works, although it seems to run a bit slow....But when I try to put Europe on a SDHC Card the TomTom just shuts down.....I have tried installing the Navcore and the maps on the SDHC Card but the red cross on the memory card appears on the unit and nothing happens.I formatted the internal memory and left it blank......But I'm all out of ideas.....What is the correct procedure to allow this to work ?

Many thanks.

lammy wrote:But I'm all out of ideas

Please run tomtom-tools-f127/tomtom-current-configuration-2011-t7501.html#p45393 & post the results here.

Thanks Tendriver....Schoolboy error on my part.....I added 5.5136 Bootloader, and everything is working fine.

Cheers for that.

lammy wrote:I added 5.5136 Bootloader, and everything is working fine.

I was sure you had a bootloader issue. Just wanted to confirm it with the current configuration results.
Thanx for the update.