Re: GWK15F Update
Could this update be Android 2.3.7?
See
Samsung Nexus S Properties | Handset Detection
"111428810 Mozilla/5.0 (Linux; U;
Android 2.3.7; en-us; Nexus S 4G Build/
GWK15F) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1"