Is there any hope for an iPhone 4s that cannot access WiFi after iOS 8.1 ?

I bought a "very good" used unlocked 4s on eBay back on Oct 2 ... it arrived with iOS 8 installed ... AT&T folks told me not to load that SW when I went in to move my SIM from an Android phone to the iPhone ... when the saw it was already loaded they were amazed that it would even start up ... but it seemed fine until I got home and tried to set-up my WiFi ... all kinds of problems ...  which led to upgrade to 8.01 and then to 8.02 ... all the while hoping to see some fixes ... but things went from not so good to terribly bad ... Bluetooth was off .. and the option to start it was greyed out ( but the little rotating gear continues to run constantly - can't stop that ) ... similarly the WiFi option was off and and was likewise greyed out and inaccessible ... then messaging was no longer accessible ... and to top it all off the phone now discharges in 2-3 hours ... even when powered off ... kind of scary ... but on Mon the 20th I was able to download iOS 8.1 to my Windows XP iTunes (took almost 6 GB to do that - downloads a huge file and then has to extract it, before installing it -- and instead of getting rid of the mess it makes, it puts the no longer needed files in the recycle bin taking up more space -- took me 6 hours to get thru all of that .... and all for naught ... still nothing works ... tried resetting networking ... resetting everything ... useless ... even drove 10 miles to a Starbucks to get a different WiFi ... but nothing works.

You should try these steps:
iOS: Wi-Fi settings grayed out or dim
Symptoms
In rare instances, the setting to turn on Wi-Fi on your iPhone, iPad, or iPod touch may appear grayed out or dim. You might see the following when you tap Settings > Wi-Fi.
If this occurs, your device won't respond when you try to turn Wi-Fi on. If you're using iOS 7.1, "Wi-Fi Not Available" might appear in Control Center.
Resolution
Follow these steps to resolve the issue:
Restart your iOS device.
Make sure that airplane mode is off by tapping Settings > Airplane Mode.
Reset the network settings by tapping Settings > General > Reset > Reset Network Settings.
This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
Make sure that your device is using the latest software. To do so, connect your device to your computer and check for updates in iTunes.
If you still can't turn Wi-Fi on, please  contact Apple for support and service options. If you can turn Wi-Fi on but are experiencing other issues with Wi-Fi, see  how to resolve those Wi-Fi issues.

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