The problem with any of these types of tool they are probably made in China by people getting paid next to nothing.
We buy this stuff from the bay or Ali express and plug it into probably the second most valuable thing most of us own and there are bound to be occasional problems.
A friend who runs his own garage has a Snap on code reader diagnostic tool and even that has problems, he was connected to a Focus recently and trying to recode the steering rack, several warning lights came on and the tool shut down and rebooted it self. Luckily on the second go it worked but he reckoned he was worried for a while knowing what jobs like this can cost to remedy.
Some garages now will only do the mechanical work and then take the car to the main dealer for stuff like this as they have been caught in the past.
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