[Upgrading, Modifying and Unlocking] alysonnx:
Hi,

So I have a rather unheard of problem. I was given a phone from a friend before they moved out of state and have no way of contacting them anymore. I turned it on and it had a pass code so i just figured i would do a factory reset ( or what i assumed to be a factory reset) using the buttons on the phone. I used the recovery menu to get to the screen that gave me the options to wipe data, or install update from apk, or factory reset the phone so i used the volume buttons and clicked reset. I let the phone do its thing and when it turned back on it goes to the google factory reset protection page saying i need to login using a google account that was previously used on the phone before the reset. FML! i used the talk back option to be able to access the settings menu and figured i would just do the reset from the settings menu. This is were all of my problems begin!! I can access the settings menu and get to the back up & reset and then click the the Factory reset option. However, the factory reset screen has a button at the bottom of the screen that says Reset Phone and when I click the Reset phone button, absolutely nothing happens. (It makes a click sound but it doesn't do anything at all)

The Other Problem!!: For some unknown reason i cant seem to access the developer options and enable USB debugging. even after i put the phone in safe mode i still could not get the developer options to appear. I have no clue what i am doing wrong but i feel like i am running into a brick wall and not matter what i click or press the phone just will not do what it is suppose to do! I tried every way I can think of to enable USB debugging but, no matter how many times I try to click Build Number or Build Version ( whatever it is exactly called, hopefully you can understand what I mean) nothing happens! I have tried to install a USB debugging app from a qr code but it won't read the qr code from the camera app. I was able to access the camera app using the same talk back trick that i used to get into the settings. I keep telling myself if only i knew about the talk back trick to get into the settings menu before i stupidly reset the phone when i first saw the pass code. So I am hoping that a google FRP Bypass program will work and help me make the phone usable again!! Does anyone have any suggestions or advice?? I am open to all ideas.

So far i have come up with a few ideas but idk if any of them are even possible to accomplish! Can someone help me out and tell me if any of the following options are even possible and whether or not it will be helpful and make the phone usable so i can have a cell phone again. Please, Please can someone help me!! Ideas:

1.) Use a Google Factory Reset Protection Unlocking program.

2.)Somehow completely delete the entire phone and reinstall the marshmallow android OS, like when you would do a fresh clean install of windows on a PC, (IDK if this is even possible but i am assuming it should be)

3.) Rooting the phone and finding a new custom ROM. ( I haven't even done anything like or close to rooting a phone, but im guessing it cant be that hard, right? Google and YouTube have vast amounts of tutorials........, hopefully,....right?

4.) I have backups of my older phones that i am wondering if it would be possible to use one of the backups i have saved and somehow putting it on the phone as a way to get pasted the FRP lock? I haven't a clue if the backups are only usable to the specific phones that created them or if they can be used on any phone?

5.) Downgrade the Android version to a older version that doesn't have the FRP lock, then once i have access into the phone i can just upgrade the phone after i logging into my google account.

6.) You know how Windows PC have the restore option in the settings so you can go back to a previously made restore point? Like turning back the clock so to speak, Is this option available or does it even exist at all on Android? I was thinking if it does i can just simply store the phone back to before i stupidly reset it and then use the trick to bypass the screen lock code and use the settings to do a hard reset ( I really don't think this option even exists or is possible but im literally at the point of willing to try and do absolutely anything to be able to have a phone again! Please and thanks! It is a ZTE Z837VL and it is Android marshmallow, Android Version 6.0.1 (I'm not sure if the

Android version matters or not?)

Thanks. Also If this is the wrong place for this post then please just let me know where the correct spot is to post and i will quickly fix it!! I am new to the site and I have read alot of posts and truthfully, feel like i have overwhelmed myself with trying to make sure i do things the way its supposed to be done. I know many most likely ALL of the members on this site are advanced and way more knowledgeable about the mobile phone information. I do know alot of computers and I have alot of programming experience but i have only focused on PCs and am just starting to learn what i can about mobile development.

Thanks again for helping me and sharing whatever you can with me to help solve things. I am really hoping not to end up with a paperweight haha!!

Alyson