Google soon won’t let you sign in on very old Android devices

If you still have a device running Android 2.3.7 (the final version of Gingerbread) or older, Google won’t let you sign in to your Google account on that device starting September 27th.

Source:

https://support.google.com/android/thread/118703101/sign-in-on-android-devices-running-android-2-3-7-or-lower-will-not-be-allowed-starting-september-27