Rooting a phone stuck on start up - Galaxy S III Q&A, Help & Troubleshooting

Hi, I've had a quick search and couldn't find anything that matches my question.
My S3 is stuck on the flashing 'Samsung' screen, I've tried connecting it to my pc to restore it with Kies but it won't load up. I've never tried to root it so could I put the phone into download mode and root it then save my data?
I've done a far bit of reading trying to fix it and I've started the phone in boot mode and wiped the cache but I need to get my data off the phone.
I'd be grateful for any help. Thanks:good:
Edit: I rooted it because I got bored of waiting and it still isn't getting past the flashing Samsung screen any ideas?

Try flashing the exact same firmware with Odin, disable kies first.
This might allow your phone to boot but you'll probably have to factory reset anyway. If done in recovery this shouldn't wipe the internal sd card, but you will lose all apps and settings etc.
For the phone to spontaneously stick during boot usually means a corruption issue, most often of the internal storage.

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HELP -- Galaxy Tab Stuck

This is my first post, and the only reason I am resorting to this is because I have scoured all existing threads and have exhausted just about every course of action. This is my last resort.
The other day I went to work and left my rooted P7510UW Tab charging. I came back and it wouldn't boot up normally. I held the power button down for about 10-15 seconds and it finally booted, but only to the Samsung logo with the lock image. It will not go past this screen. Until this point I have never had any problems with the device. The good news is that I can get into CWM recovery; unfortunately, I cannot wipe the data. Wiping the cache is fine, but when I attempt to wipe the data and get back to factory settings, it freezes at "formatting data." But I guess the good news is that I can get into CWM recovery and Odin download mode.
I have tried the "Overcome" method. The PIT file takes but the tar file does not. I've tried flashing the stock firmware to no avail. I've tried different laptops, different USB ports, etc. I get a downloadpartition_odin error on the device and an RSQ error in Odin.
I am able to flash a recovery image but after that my options are limited and I don't have a nandroid backup.
I have ADB working on my computer and have tried to wipe data in fastboot but I keep getting a "waiting for device" error.
I'm not a complete noob in that I can understand most directions and follow accordingly but I am having trouble solving this on my own and don't know what course of action to take. I do have an external SD card and adapter if that provides any new course of action. Is there some way I can clear the data in CMD? If so, what steps and commands do I need to accomplish this? So far I have been piecing together parts of existing threads to try and solve the puzzle but obviously have not been able to get it all together yet.
Is there anything that can be done to save this?? Any help is GREATLY appreciated.

[Q] Recovering contacts from a soft bricked S2

Basic info: phone is not rooted, the only messing I have done with it was to flash an updated official firmware via Odin (2 years ago) and after that even Kies recognised the firmware as the one I should have.
Yesterday I had a freeze at ~44% battery, did a reset and the phone booted with 0% battery. It switched off, so I took the battery out, put it back in and swtiched it on again. It showed 10% battery, but before completely booting up it froze again. From this point on every time I switch it on it gets to the pulsing 'SAMSUNG' screen at startup and stays there forever.
I am buying a new battery tomorrow. I have researched some ways I can recover the phone, but I am not sure if they will wipe the data. In particular, I would very much like to save my contacts. Is there a way to do this? For example, I read that to flash CWM recovery with Odin I need to unlock bootloader, which will wipe my data. Would one of the various data recovery softwares work in this case (Yodot, Dr.Fone)? Can I get an update to the firmware to my SD card and apply it from the stock recovery, possibly not wiping the phone and recovering the OS?
Also, FYI, I can get to recovery mode, to download mode, but not to safe mode.

[Q] Factory reset from settings --> boot loop

My daughter's i9300 started resetting itself without control. Today it got unmanageable and a successful boot became impossible.
Looking around, I found a thread suggesting that the power button switch is the culprit.
Indeed, after removing the switch, everything worked fine. Had major issues starting the phone, but eventually it started, so I was good to go.
I rooted it, installed latest TWRP and Resurrection ROM. The ROM was a random pick more or less, I had it on my LG G3 at some point and I wanted lollipop.
All fine and dandy, I was able to get into the phone. However, data wasn't wiped even though I selected it for wiping in recovery (probably didn't select the right thing...). So I went to settings and chose factory reset with wiping all data.
This lead to phone rebooting to recovery, but TWRP logo just flashes every few seconds without ever getting to recovery itself.
How can I make this phone work again? Any ideas?
Boot into download mode then flash a full stock rom with Odin. If that works then factory reset in recovery before testing.
You may find the firmware won't flash, as it sounds like your nand memory is worn.

SM-G920W8 /efs fails to mount phone doesn't boot.

I was recently given an S6 from a friend who won it but already had one. I was excited to try and root it, foolish of me to think about maybe getting more information, and I attempted a CF-Autoroot. The root claimed, in Odin 10, to have succeeded. However, it fails to boot entirely. The grey android screen that flashes the word "erasing" as the loading bar progresses during firmware reboot makes it half way before restarting. Now I can boot into Odin mode, and I can boot into recovery. USB debugging was off at the time the phone started to act up so that's a no go. I have tried multiple times in restoring it to no avail. The phone recovery says "failed to mount /efs."
Odin mode said custom and then, after using kies to attempt a restore, would fail to complete and once again get stuck on SAMSUNG screen. If I Return to Odin mode I would notice that the system went back from custom to Samsung again, though the knox counter was still at 1.
I am able to load TWRP and occasionally manage to format and tweat partitions to mount the phone in recovery but can't transfer any files.
I have access to a USB OTG device that loads via mini usb port in the device. This phone has caused me a lot of grief and I Can't think of any way to recover it. Essentially I am left with a brand new device that is worthless. Is there anyone out there with experience recovering this error.
Also I am unable to obtain the lost emergency firmware recovery number.
Thank you in advance for all the time and efforts that I hope will be provided. I have spent many days on this device trying to simply make it work.
Regards, Desmond

factory reset a rooted phone, corrupt files possibly?

i own a zte quest (n817) which is very sluggish. i had it rooted and decided to uninstall a good amount of apps to help it run faster a few months back. it worked fine for the uses i needed it for (calls, text, few apps, wifi etc.) but i wanted to do a factory reset. after doing so from the settings menu, my phone rebooted and went through the setup but the home screen is blank (screenshots below). im thinking the phone didnt reset all the way and it also might still be rooted. i wanted to know what i could do to try and recover the phone in its original state.
things ive tried: im able to put the phone in stock recovery, tried an update.zip from a similar zte phone but wouldnt work. tried a factory reset and cleared cache from the recovery. when the phone is at the home screen, i can plug the phone up to the pc and see the contents of the phone. i can also put the phone in download mode. while in download mode, tried to run some adb commands so i could maybe use dd to flash the .img files but either the operation not permitted or it just did nothing.
im trying to find the update.zip for this phone because i think that would be the simplest option. other than that, any help is much appreciated

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