[XDA Assist] Lutarisco:
Ok, so I think I was prepared for something like this, but it seems that this is too much for me:

(I don't want to bother any of you, so you can skip the story and go to the summary down there)

I have a very normal Samsung Galaxy Grand Neo, GT-I9060L (the "L" stands for latin, as I'm chilean). Since with an older phone (Galaxy Y) I had some... issues, this time I wanted to play safe and decided to not root it. Ok, so no problem since 2014... until now. This morning I went to the Google's Android Device Manager website, and noticed that, where the buttons "Lock" and "Erase" should have been, there was something like "Setup Lock & Erase". I didn't do that before? So I clicked it, and it sent a notification to my phone, requiring the activation of "Android Device Manager" as a "Device Administrator". Ok, I read and accepted. The problem then began. I mean, the phone rebooted immediately, and it got stuck in the "SAMSUNG" splash screen, with a little vibration every few seconds (usually it's once, and then it shows the lock screen). Damn! As I had enabled USB Debugging, I thought that I could do something to at least backup the data there. Well, executing `adb devices`, and trying different states of the phone (I can get it to recovery mode, and ODIN mode, but not to safe boot), the only things that I could get to were "offline" (Linux) or "unauthorized" (OS X) under Recovery Mode (there wasn't anything to do, as any command lead me to an "error: device offline."), and "sideload" under Recovery Mode > apply update from ADB, which I think is one of the two only ways to try a firmware update (I don't know if that would solve anything), but I don't know if it would delete any data. Going to the main boot loop and trying `adb wait-for-device` didn't work (it just goes offline), so there isn't a way to get the phone to a normal state of "device" in adb (in other words: i cannot start the daemon on the phone, I suppose). Another thing I could do is to install Kies and try that "Firmware Upgrade and Initialization" thing, but I'm afraid that it could also mean to wipe the data there. I don't want to do so.

I'm sorry, I always write that long (in every language...), but at least there are more details with all of it.

So, summary:

– Grand Neo stuck at the SAMSUNG boot screen, right after setting Android Device Manager as a Device Administrator.

– USB Debugging is enabled, the phone is not rooted, and the firmware is the official, I mean, never touched.

– Some time ago I dumped the ".pit" file and also got the firmware (I9060LUBUANG1) from samsung-updates, just in case.

– I can get the phone to Recovery and ODIN modes, and so I just could do `adb sideload <file>` with some <file> (zip?).

– Can't even wipe the cache partition. I think it's game over with that one.

– I could try reinstalling the firmware with Kies, but don't know (as it doesn't recognize the phone) if I could do a backup.

– I don't want to wipe, erase, nor delete any data in the phone. It's the last resource for me.

Could I get some help with this? What should I do? ADB sideload? Kies? Something about Heimdall? I use OS X, but I've got a Pi, so there shouldn't be any problems with software (also, I've got a super-slow-netbook with Win XP hidden somewhere... I wish I could install Win 10 in Boot Camp inside this MBP Mid 2009). Thank you if you get to read this, and try to understand and help me with this.

Also, I'm sorry if this doesn't belong here (or anywhere...), but I couldn't post this on the Grand Neo forum (and it confuses me: is that forum for I9060i Grand Neo Plus as it states or for every I9060?).