how to clean out a htc desire 626s I have a Boost Mobile HTC Desire 626s. I just upgraded to a ZTE Warp Elite. When I 1st got the HTC phone I got the phone rooted. The phone worked fine except for 1 annoying problem. Every few days a bar would popup saying a "system update" was needed. The only 2 options were "later (as in doing the install later)" and "install". I keep hitting later. I got tired of seening that popup every few days so I hit install. Big mistake.  The phone is now stuck in a sys update loop. It says download complete, starting to unzip the file. But the unzip does nothing then error's out after a while. I spoke to Boost Mobile today. And even bigger mistake. All the hard master reset did was wipe out my pictures, phone list and so on (all that stuff is backed up on my laptop already, no lose there). But the hard reset didn't fix the system update loop problem. And now the phone is stuck in a basic phone activation loop as well.  I am trying to setup the phone so my nephew can use the phone like a tablet for now. And if he keeps his grades up in school I will activate his phone on my cell phone plain with his own number. If I can clear up this mess and get the phone working right again. 

I 1st used the unlocker that I found on the HTC web page, then I used Kingo Root to root the phone. The factory reset line is missing from the download mode. Also if I go to bootloader > boot to recovery mode. The phone boots out to normal phone mode.  I am stuck and I don't know how to fix this.  A point of interest I an a Windows tech. I have been fixing Windows based laptops and desktops for years as well as 2 way radios and tv's.

Steve
Basically you need to do the same thing as if you had a failed update on a non-rooted phone.  Go to HTC, grab the utility meant for communicating between your computer and phone.  Then download that and a factory Android zip and use the utility to flash that to the phone.

It took me a little bit, but I seem to have dug out the official HTC info on this.

You want to go to the Manual system update instructions section on this page and follow those instructions.  If for whatever reason you can not get the utility to see the phone and flash the factory zip you are SOL without a custom recovery or ability to boot to the OS there is not anything else you can do.  You will want to send it in for warranty replacement if you have that going (contact Boost).  with the custom recovery gone and the OS stuck in a boot loop with the official OTA version (NEVER apply OTA updates or you will lose root and your custom recovery EVERY time).  If you hate the notification pop-up you should look for a ROM that says it is a rooted factory ROM with the update check modified so it does not check for updates.  Otherwise ALWAYS say update later and ignore it.

Here's the HTC info page: http://www.htc.com/us/support/htc-desire-626s-boost/news/

Also factory reset is gotten to through the recovery menu and NOT download mode.  Factory reset only removes saved user data and does nothing to the actual system files themselves.  To do that you need to actually download the zip from HTC and use their utility to flash it.

IF YOU STILL HAVE THE CUSTOM RECOVERY (TWRP OR CLOCKWORK) YOU CAN FLASH ANY ROM ZIP MEANT FOR THE CDMA VERSION OF THE 626s WHICH I FOUND A FEW LISTED ON XDA FORUMS UNDER THE 626 SECTION (here's a stock ROM you can flash with custom recovery (and if needed grab microsd card plug in to computer reader to load the file on it then plug in to phone and restart to recovery): http://forum.xda-developers.com/desire-626/development/rom-flashable-stock-htc-626s-debloated-t3293602

Again, this only works if you have the custom recovery and NOT the stock recovery.