Unlock the phone, it HAS to be on the start screen for this to work. Log in with your Windows account (same as on the phone! You can tell it worked because when you run it again, it will say “unregister” (don’t unregister, but you can check! Under the Windows Phone SDK 8.1 on your PC, run “App Deployment” and select the Custom WPSystem_0500file you previously downloaded. It's official: for all intents and purposes, the Windows Phone era is over.Microsoft has ended support for Windows Phone 8.1 just over 3 years after its April 2014 debut. IF THE APP CRASHES AT THIS POINT, you have done something wrong. In each case, pick the key, then you’ll do this: a. This ought to go without saying, but I’ve had people ask me “oh you mean I have to delete EVERYTHING? Your phone will be reset to factory at least once in this process. But if you are a privacy nut, put it all on your computer. Somewhere other than main phone RAM which is going to be completely wiped. You should get this screen (those are barcodes under the black swatches): a. If it starts to restore your stuff, let it do so – you have to wait until the queue is clear before you can proceed, so take this time to install the other software you need: 11. I know other walkthroughs say 40, and the tools say 25, but the reality is that we don’t know how fast your battery will drain once the phone is in bootloader mode. If for some reason you have Windows Insider or Preview for Developers installed, uninstall them now! Install the Windows Device Recovery Tool on your PC and run it. You may also at this point want to install HTC Sync Manager, just to get the HTC drivers. As soon as the screen goes black, hold down both volume buttons. After a few minutes, your phone will be back to Windows 8.1 factory image. You need to set up WP8.1 – sign in with your account.
Millions of users were faced with the prospect of having to upgrade their handset early to stay current, erasing a lot of Microsoft's hard-earned good will.From now on, your WP8.1-toting device won't get software updates or technical help.This doesn't mark the end of Microsoft's mobile ambitions (Windows 10 Mobile is still hanging around), but it does finish a long, sad story in the company's history that reflects the tech giant's shifting priorities. If you want HTC Sense TV, download it from the store now, since after this step it will be impossible to install. Nothing you’ve done until this point has been destructive or done anything other than a reset. Navigate to storage sense and set apps to install to the SD card. You MUST be logged in with the correct Windows account. If you have to, drop back to the system restore again using the Recovery Tool. Go to the apps pane, and you should see that Preview for Developers now has a weird green icon with a key on it instead of the purple icon it came with. Basically we are about to trick the phone into thinking that it’s a Nokia Lumia 735, which is a phone with roughly similar specs to this one, at least as far as the Windows 10 update process is concerned. It was supposed to be a match made in heaven (Microsoft got a huge, reliable partner while Nokia got a modern OS), but it mostly led to a lopsided Windows Phone market where third parties always played second fiddle to the latest Lumia.That Microsoft ditched Windows Phone entirely in favor of Windows 10 Mobile says a lot. If for some reason you still have Windows Insider or Preview for Developers installed (you shouldn’t, after step 2), uninstall them now! Under the Windows Phone SDK 8.1 on your PC (NOT THE 8.0! Windows Phone 7 was launched in 2010 as Microsoft's formal response to the i Phone and Android.This was the release that was going to prove Microsoft could make a truly consumer-focused mobile platform instead of catering primarily to the business crowd.