Electically its not reporting its a winbond chip.
see the official winbond data sheet, linked from Digikey ( https://www.winbond.com/resource-files/ ... %20kms.pdf )
page 24 , section 8.1.1
the original chip code of is a Winbond code, because it starts with 40
4018 is the code that all normal GD77 radios chips report.