Thanks for the advice,
By the way, in my f500bt, leetlauncher boots from the USB and then hangs (I have not found any info on Leetlauncher running from an USB, maybe I am doing something wrong or it is not possible).
I have also found test mode USB version but have not tested it yet.
I will check if USB booting is possible first (I'd rather not removing the dashboard, screws, etc. to reach the Sd card I have at present just in case I introduce some noises in the dashboard).
If it does not work, I will have to install testmode in the Sd card, but then I would boot always in t