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GT-P6210MA boot loop / hangs at splash screen

Hello,
I'm new to the community. I generally work on PC but a friend brought me this Samsung Galaxy tab 7.0 Plus that turns on but is stuck at the "Samsung Galaxy tab 7.0 Plus" splash screen when it first turns on. I have tried the" Power+Vol up" to reset to factory but it seems to go too-quickly and then I am back to square one because nothing changed. I dont know if my friend or his kids tried to do anything crazy with this so I don't have much more info.
What I am asking... I want to get this tab back to factory, or at least a working ROM. any advice is helpful but please keep in mind I have never really worked on these devices, the one thing I do know is if I jump to conclusions I can brick the device.
Thanks in advance. If more info is needed please ask.

did you try with a retore power + vol down with Odin
http://www.sammobile.com/firmware/?page=3&model=GT-P6210&pcode=XAR&os=1&type=3#firmware
choose between 3.2 honeycomb or 4.0.4 ICS
I got the same problem before !!!

http://forum.xda-developers.com/showthread.php?t=1827942
There is my solution

I had a very similar problem to both of you and noticed that the /data (instead of /efs) directory/partition "didn't exist" according to the boot screen when i entered the default recovery mode. i partitioned it and ran a factory reset and it finally booted.
and all just in time to pull the factory US ICS update

[Q] LG G2 Sprint stuck in bootloop, no recovery please help

Hey guys.
I'm new in the Android world and bought an LG G2 back in november.
I had originally intended to custom install cyanogenmod or KitKat 4.4 to replace stock rom, but I couldn't find a way to install a custom recovery, and was only able to root my device via Kingo Android Root.
A while later I saw an update that popped up, and not knowing any better I clicked install. It was about 114MB. That was about 3 days ago, and my LG G2 has been stuck in a bootloop ever since.
When I try to turn it on the LG logo shows up, then it says "secure booting error"and "Cause: boot certification verify" on the top left corner of the screen in white text.
I tried doing a hard reset, but that didn't work. I don't have a custom recovery so that I can clear the cache and data or something. So pretty much I have a bootlooped phone with no custom recovery, I can't do a hard reset, and it's Sprint and everything's new so it's harder to find a fix.
Does anyone here know of a way I can fix this? It would be much appreciated.
Thanks in advance

[Q] don't boot after screen replacement

Hi there,
I changed my broken screen on nexus 5 but after that unable to boot.
I can boot in recovery mode, actually I did a factory reset and also a fresh ROM installation via ADB.
The problem is still the same: the device seems to start normally, I see google logo etc but when I have to put pin to unlock SIM I see the screen for half second and then the screen go black.
Please help me!
Thanks,
Sandra

Stuck in 'Your device has been unlocked and can't be trusted'

So, I think I soft bricked my Huwaei GR5 MINI phone.
The problem is, it's stuck in the screen saying:
Your device has been unlocked and can't be trusted.
To learn more, visit: some link of emotiondownload.php
Your device is booting now...
Click to expand...
Click to collapse
and that's it, it's stuck here after I tried unlocking my bootloader officially. I basically tried to give an upload that came officially from Huwaei. I tried giving it after unlocking the bootloader and now it's stuck in the same screen. I can't close my phone nor I can open it. It's just stuck like this forever. I tried pressing long the power button. Basically, it turns off the phone and again opens but stuck at the same screen. Tried going to the recovery mode/fastboot mode but same result, it turns off the phone and comes back to the same screen saying the same message everytime.
Please help me anyone. I can't seemed to fix this problem by any means. It would mean the world if you could help me out regarding this issue.
Thank you tons for helping out !

completely stuck at "firmware update encountered"

When i got the phone it was already dead (stuck at logo). then i flashed the phone's firmware. it did succeed but wont boot up. some weird thing happend and i flashed twrp (hoping to revive through custom ROM instead). it was very difficult but i succeed. When i was finally flashing custom ROM ( it took a hell of a time) , the process finished and at the initial boot-up, the screen went crazy like when you see your T.V doesn't have signal like burrrrrr.
I took it to nearest technicians but they said i have corrupted my partition and there is no way to fix it.
Now the screen is stuck at " firmware update encountered an issue. please select recovery mode in kies and try again.
Hoping response asap.
Desperate
Thanks in advance.:good: