[Desire 816 Q&A, Help & Troubleshooting] witchywoman:
Hi, total noob to Android hacking and rooting here...

I'm in the US and have the HTC Desire 816 (710c) on Virgin Mobile. Really wishing I'd done better research about the Desire 816 and VM before buying this phone. It's a great phone except for the small HD. I didn't realize just how many headaches that small HD--and Virgin's tight-fisted grip regarding their unlock policy--would cause me!

Forgive the length of this, but I'm hoping more detail as to what I've done/tried will help find the right solution...

I was doing fine on KitKat and for some reason decided I wanted to upgrade to Lollipop--mistake number 1! :( I first installed the update over KitKat but had some issues. Nothing major, but I figured something was definitely wonky when I noticed the basic stock web browser was gone--not that I really use it, just wanted to test something with it. (I was having an issue in Habit Browser, didn't realize 'til later that it was because I had my download folder setting on external SD card. While that worked in KK, it didn't in LP.) So, I did a backup...or THOUGHT I did. HTC Backup app was supposed to have been backing up my phone every day to Drive...turns out, it wasn't, despite notifications that it was working. So, anyway... I went ahead and factory reset the phone and reinstalled Lollipop. UGH! An even bigger mistake. Over 6 GB of the HD gone, just from stock LP!

Then I thought maybe if I unlocked the phone, I could delete most of the junk, even still using the stock OS. I followed the directions on HTCDev and although the proper screen appeared on the phone and asked me if I wanted to unlock, and I replied yes, it didn't work at first. The phone rebooted and everything was the same. Reboot checker confirmed failure.

So, as I was ready to try to narrow down my list of previously installed apps to absolute essentials due to the reduced disk space, I thought to see if there was a a way to revert to KitKat. I followed the instructions here http://xdaforums.com/desire-816/general/ruu-t2952058. I tried the RUU .exe first. It failed, telling me I needed to get the correct RUU and try again. However, HTC's website does NOT show any KK downloads for Virgin Mobile USA for this device. More on that in a moment...

I also tried the flashing via SD card method. It also failed. I thought, what the heck, I'll try steps 3 and 4 of the SD card method, flashing the stock recovery and lock the bootloader, even though I thought my device was locked. Well, I guess I didn't notice when I went into fastboot that the device indeed HAD at some point unlocked, after all.

After those steps, I now had the following show up:

*** Software Status: Modified ***

*** RELOCKED ***

SECURITY ALERT!

I tried flashing the ROM.zip from SD card method again. It failed spectacularly, saying something about about a large file (some of the text was beyond the edges of the screen, so I couldn't read all of it. There was also an instruction to press power to reboot. The phone went back into fast boot screen with red highlighted "!! Image Update FAIL !!" Mind you, this was with the SD card now removed. I did manage to get the phone to boot normally again, back to stock Lollipop.

Now I thought I would try flashing the WWE KK download from HTCDev. Well, I didn't get the large image fail message, but it did fail saying that it was not the right image.

I tried unlocking the phone again, via the instructions at HTCDev. Didn't work. Thought I would try the ROM.zip file from the thread here at XDA one more time. Same fail message as before, same behavior of phone getting stuck on flashboot screen with red error message on initial attempt to reboot the device. I do notice now that although phone status is still modified and relocked, the security alert message is gone.

Can anyone help? I just want KitKat back so I can reload all my previous apps! (or possibly a good KK equivalent non-stock ROM, once I get the phone unlocked again? I have no idea which one though, being a noob :/ )

Thanks!