I'm trying to help a friend who has a Samsung SGH-S730M running Android 4.0.4, not customized by or locked to any carrier. She had a problem with Yahoo Mail after changing her password from another device. Another friend recommended that she uninstall and reinstall the mail app, but now she's getting an error from Google Play that the app is incompatible with her device; it requires at least 4.1. She tried several third-party mail apps, but none integrated properly with her various contact sources. It appears that Yahoo Mail 4.7.2 (or perhaps 4.7.4) is the newest version compatible with Android 4.0.4, but the oldest I could find on apkmirror or other reputable sites is 4.8.2. Older versions found elsewhere all seem to be malware. Is there a reliable source for a compatible APK? If not, can the OS be upgraded to 4.1 or better? (Check for update reports nothing available.) If not, and she buys a new phone, is there an app that can automatically do all or most of: install her apps, restore settings from the old phone, restore accounts and passwords, restore Wi-Fi networks and associated keys, etc? Thanks.