Fgsstnre mean chassis number.
You were in your cars hidden on board comptuer menu.
If you carry out the correct steps, the read out will give you Fgsstnre followed by the chassis number (vin number of the car) of the car.
this is not a fault. this is normal and expected behavior when you carry out certain steps in the on board computer.
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that has nothing to do with Fgsstnre
you can try to reset it with the process below
if it wont reset, unhook the battery for an hour and try again. If it still won't reset, then there is a fault and BMW will need to scan the car.
as your question regarding Fgsstnre has been answered, please kindly select a positive rating so that I receive credit for my answer, thank you.
reset process: CLICK HERE