i think we need more new user report their Serial to confirm fw,i dont think my new switch is return to the shop from other user because it look like a new goods.the shop say if your switch have any problem please go to nintendo service centre
i hope can help u all
Serial: XAJ400181xxxxx
Region: JPN
FW: 3.0.0
Colour: Neon red + blue
Purchased Date : 22/8/2017
Store: Normal Game Shop in Hong Kong
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Serial: XAJ700024xxxxx
Region: JPN
FW: 1.0.0
Colour: Gray
Purchased Date : Release
Store: Normal Game Shop in Hong Kong