Can't "Manage POIs", TT device reboots

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What kind of POI? Some of the origin TT-POIs like speedcam (*.ov2/*.ver) or some 3rd party POIs (*.ov2/*.bmp) are corrupt.
And use only TT-POIs for your current map, e.g. no POIs of Brazil in a european map or UK-POIS in a DE_AT_CH.
Do it slowly, add the POIs step by step and test every time for them.
If the boot loop occurs after adding a special POI, you have the corrupt POI.