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Galax S7 does not turn on – Nothing works

Hi,
today in the morning I couldn’t turn on my S7. It went off while charging overnight. Then I tried to hold the volume down and the power button together for twelve seconds and the S7 turned on. Unfortunately it just boots to the Samsung logo and nothing happens since then.
I wrote to the Samsung support and they told me to send it in. And they also said that I will lose my warranty if I make a hard reset. Is that true? Because the other thing is, that I really need some very important data from just one app. I already did a hard reset in the past and the data from this app didn’t get lost. I don’t know why (no cloud synchronization) but it worked. My plan was to try a hard reset but my phone is fully charged and I cannot turn it off to get into Recovery mode.
So basically I have three questions:
1. Will I lose my warranty if I do a hard reset?
2. Is there any possibility turn off my phone or to unload my battery? (And after that to try a hard reset.)
3. Does anyone have any idea how to save some date by any other way?
Thank you very much for any help!

Samsung are full of sh** if they told you you would lose warranty by performing a full reset, nothing of the sort
Warranty is checked by KNOX 0x0 = valid (Or 0x1 if it is tripped) which is only tripped by flashing something custom / rooting
Try booting into recovery and clearing only the caches, see if you can get back in that way
Otherwise, flashing the same stock ROM over the top with ODIN may work

Thank you for your answer.
Any idea how to boot into recovery mode? The problem is that in the moment I cannot turn off my phone and it's fully charged. I guess it would last some days to wait until the battery is empty. And unfortunately you can't remove the ****ing battery.

robsen1 said:
Thank you for your answer.
Any idea how to boot into recovery mode? The problem is that in the moment I cannot turn off my phone and it's fully charged. I guess it would last some days to wait until the battery is empty. And unfortunately you can't remove the ****ing battery.
Click to expand...
Click to collapse
Volume up & Home & Power
Keep those buttons held in until the phone reboots, continue holding them and it should reboot a 2nd time, this time hopefully entering recovery
You can try the same for download mode, which is the same combo, only volume down instead of up

*Detection* said:
Volume up & Home & Power
Keep those buttons held in until the phone reboots, continue holding them and it should reboot a 2nd time, this time hopefully entering recovery
You can try the same for download mode, which is the same combo, only volume down instead of up
Click to expand...
Click to collapse
I did this combo. Following message did pop up:
"Warning
A custom OS can cause critical problems in phone and installed applications. If you want to download a custom OS, press the volume up key. Otherwise, press the volume down key to cancel."
First i pressed the volume down button and then nothing happened and it booted again until the Samsung logo. In my second try I pressed the volume up button and now I am here (see attached pics).
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Any advice?

robsen1 said:
I did this combo. Following message did pop up:
"Warning
A custom OS can cause critical problems in phone and installed applications. If you want to download a custom OS, press the volume up key. Otherwise, press the volume down key to cancel."
First i pressed the volume down button and then nothing happened and it booted again until the Samsung logo. In my second try I pressed the volume up button and now I am here (see attached pics).
[/hide]
Any advice?
Click to expand...
Click to collapse
Well that's download mode where you can flash the stock ROM with ODIN, so you can at least flash stock again, which may work, but I would try recovery first though, the first combo I posted with Volume Up

*Detection* said:
Well that's download mode where you can flash the stock ROM with ODIN, so you can at least flash stock again, which may work, but I would try recovery first though, the first combo I posted with Volume Up
Click to expand...
Click to collapse
I tried the combo with the vol up key and I came to the exact same menu which I described above. (Then I pressed the volume down key and the phone boooted to the Samsung logo).
Now only the combo with the vol down key works. If I press vol up + home + power nothing happens. I don't get this ****.

robsen1 said:
I tried the combo with the vol up key and I came to the exact same menu which I described above. (Then I pressed the volume down key and the phone boooted to the Samsung logo).
Now only the combo with the vol down key works. If I press vol up + home + power nothing happens. I don't get this ****.
Click to expand...
Click to collapse
OK, it's possible that recovery got corrupted then
Right, so grab a stock ROM from here
http://updato.com/firmware-archive-select-model?q=G930F
Extract and Load the .MD5 into ODIN AP section
Put the phone into download mode and hit start
It should reboot hopefully into a working OS
if not, try entering recovery again
ODIN
http://forum.xda-developers.com/android/software/odin-3-12-3-worlds-att-s7-odin-firmware-t3401470

*Detection* said:
OK, it's possible that recovery got corrupted then
Right, so grab a stock ROM from here
http://updato.com/firmware-archive-select-model?q=G930F
Extract and Load the .MD5 into ODIN AP section
Put the phone into download mode and hit start
It should reboot hopefully into a working OS
if not, try entering recovery again
ODIN
http://forum.xda-developers.com/android/software/odin-3-12-3-worlds-att-s7-odin-firmware-t3401470
Click to expand...
Click to collapse
So do I loose my warranty if I do this?
(Sorry for my dumb quesiotns and thank you for your help...)

robsen1 said:
So do I loose my warranty if I do this?
(Sorry for my dumb quesiotns and thank you for your help...)
Click to expand...
Click to collapse
No, as I said earlier, warranty is only affected if you flash something custom
Stock Samsung ROMs are not custom

For a very short time my phone startet adnroid, but everyhing was black und I just saw the notifications bar. I couldn't do anything. After that my phone did a reboot and now I am again at the Samsung logo. The combi with vol up still doesn't work.

robsen1 said:
For a very short time my phone startet adnroid, but everyhing was black und I just saw the notifications bar. I couldn't do anything. After that my phone did a reboot and now I am again at the Samsung logo. The combi with vol up still doesn't work.
Click to expand...
Click to collapse
You managed to download and flash a stock ROM in that short time?
Might need to flash the entire set of files from the ROM download in ODIN, which I think might reset the phone with one of them (HOME I think)
EDIT - Another option would be firmware recovery using SmartSwitch
http://www.samsung.com/uk/smart-switch/samsung-desktop-app.html

Good day.
Recently happened to me something similar, while i was playing, the phone rebooted and got stuck at samsung logo.
The phone was rooted, with TWRP and Xposed.
Really don't know what happened. At the time, in panic, i flashed a stock ROM and the phone never booted again. Just a blank screen and a blue led.
I sent my phone to Samsung for warranty and 1 month later (5 days ago), got it back working, even with KNOX 1x0.
In most of Europe, Samsung cannot charge you anything even if the phone was rooted, with the exception if it was root that directly caused the malfunction.

I am having the same problem. the combo with Vol up does not work. Any further help, PLEASE?

'custom binary blocked' and can't access download mode.. please help!

hi
I have galaxy s7 SM-G930F
I have problem that my phone doesn't boot it just show the galaxy s7 logo and write on top of the screen: "custom binary blocked by frp lock"
see pic that I found and it look like my phone:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I've searched for solution online and Ive found out that I need to flash original firmware via ODIN.. I want to do it but I just can't boot into DOWNLOAD MODE!! I press home+volume down+power but it doesn't do anything! it just loop and loop and loop to the S7 logo..
please please help!! :\

I know you've probably tried it but
Volume down
Home button
Then press power button
Any joy with the recovery method?

iamsloany said:
I know you've probably tried it but
Volume down
Home button
Then press power button
Any joy with the recovery method?
Click to expand...
Click to collapse
I have tried that combination.. it's just loops to S7 screen..
I can boot to recovery but when I try to format factory it says: "mdm does not allow factory reset" and it reset and turn off..

Is it rooted witg custome recovery or stock recovery?
If it is with a custom, try transferring a rom over in mass storage, if not, then I'm out of ideas

iamsloany said:
Is it rooted witg custome recovery or stock recovery?
If it is with a custom, try transferring a rom over in mass storage, if not, then I'm out of ideas
Click to expand...
Click to collapse
it was rooted with TWRP recovery.. but somehow it was vanished and now I have stock recovery.. :/
is there a way to force download mode?

Unless theres an option in stock recovery wgich i think tyere is, restart to bootloader try that, if not then someone with a vit more knowledge will come along

iamsloany said:
Unless theres an option in stock recovery wgich i think tyere is, restart to bootloader try that, if not then someone with a vit more knowledge will come along
Click to expand...
Click to collapse
there is an option: "reboot to bootloader". I press on it, the phone restart to S7 logo with "custom binary blocked by frp lock" and shut down..
I gotta do something.. :\

Im all out of ideas sorry
---------- Post added at 01:20 AM ---------- Previous post was at 01:04 AM ----------
have you tried smart switch?

iamsloany said:
Im all out of ideas sorry
---------- Post added at 01:20 AM ---------- Previous post was at 01:04 AM ----------
have you tried smart switch?
Click to expand...
Click to collapse
what should I do with that?

Just a suggestion, give it a go

iamsloany said:
Just a suggestion, give it a go
Click to expand...
Click to collapse
the computer doesn't recognize my phone at all..

up

Hold Volume down & Home & Power until the phone reboots two times (Twice) keep buttons pressed through 2 reboots
See if it enters download mode

*Detection* said:
Hold Volume down & Home & Power until the phone reboots two times (Twice) keep buttons pressed through 2 reboots
See if it enters download mode
Click to expand...
Click to collapse
no help.. it just reboot and reboot and reboot.. endless..

Try Smart Switch Emergency Mode

Hi-TechUp said:
Try Smart Switch Emergency Mode
Click to expand...
Click to collapse
the phone doesnt recognized on pc.. :\

up

Don't hold the power button, just home + volume down. Hold those two buttons down, it may reboot a couple times but it should eventually get into download mode.
If not, try home + volume up to get into recovery (stock or twrp, either should work.) From there, try factory reset.

weirddan455 said:
Don't hold the power button, just home + volume down. Hold those two buttons down, it may reboot a couple times but it should eventually get into download mode.
If not, try home + volume up to get into recovery (stock or twrp, either should work.) From there, try factory reset.
Click to expand...
Click to collapse
if I press volume down+home+power and immediately release the power button it just turn on and turn off like always..
I can get to recovery mode, but when I try to factory reset it writes me: "mdm does not allow factory reset" and turn off.
please hellppp!! :\

-OreN- said:
if I press volume down+home+power and immediately release the power button it just turn on and turn off like always..
I can get to recovery mode, but when I try to factory reset it writes me: "mdm does not allow factory reset" and turn off.
please hellppp!! :\
Click to expand...
Click to collapse
There's an option to flash an update from sdcard in stock recovery. I think it needs to be an OTA update. Not entirely sure, but you could try doing a search for instructions on that.

HTC u12 +NO RECOVERY MODE

Guys I have a problem, I forgot the screen key, and now I do not know how to come back again, what I try to do is this:
1- I turn off the phone
2- I press the power button and it barely vibrates (or the LED goes off) I press VOLUME DOWN.
3. That takes me directly to the Bootloader (where I can see some htc information and little else)
4. After that I press volume down, until reboot to recovery, and there I get that
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
i can select too reboot to download and i get that
but whatever i enter on reboot to booloader the phone turn off and i get the bootloader menu, at this time i select REBOOT TO recovery
it appears that
and then this appears
And this is my problem here I can not enter the recovery mode, because remember that the htc u12 + can only press 1 button, that is, you CAN NOT PRESS POWER + VOLUME UP at the same time, I do not know what to do

The U12+ doesn't have a recovery mode. It uses the A/B partition scheme, similar to the Pixel and Pixel 2 devices. They don't use separate recovery partition, because the second system slot acts as essentially its recovery.
What do you need recovery for? TWRP isn't available for the device yet. And when it is it will be built in as a boot image.

DaConcho said:
The U12+ doesn't have a recovery mode. It uses the A/B partition scheme, similar to the Pixel and Pixel 2 devices. They don't use separate recovery partition, because the second system slot acts as essentially its recovery.
What do you need recovery for? TWRP isn't available for the device yet. And when it is it will be built in as a boot image.
Click to expand...
Click to collapse
and what can I do to get my phone back? I can still return it

darbloader said:
and what can I do to get my phone back? I can still return it
Click to expand...
Click to collapse
Just reboot the phone by hold down the power button.

schmeggy929 said:
Just reboot the phone by hold down the power button.
Click to expand...
Click to collapse
i forgot my screen password, so if I do reboot it turns on and asks for the code. That's why I want to restart the phone to factory

darbloader said:
i forgot my screen password, so if I do reboot it turns on and asks for the code. That's why I want to restart the phone to factory
Click to expand...
Click to collapse
I haven't tried yet, but if you put the wrong password in too many times does it not force a factory reset?

QD2DC said:
I haven't tried yet, but if you put the wrong password in too many times does it not force a factory reset?
Click to expand...
Click to collapse
i did more than 40 times....

darbloader said:
i did more than 40 times....
Click to expand...
Click to collapse
Do you have an SD card? You can place the RUU zip file on the SD card and flash that from download mode.
RUU can be found here: https://forum.xda-developers.com/u12-plus/how-to/collection-htcu-u12-ruu-firmware-t3794664
Follow the instructions in post 4 for using an SD card.
The other option is to just run the RUU from your computer, but that may require you to grant access from the phone, not sure.

DaConcho said:
Do you have an SD card? You can place the RUU zip file on the SD card and flash that from download mode.
RUU can be found here: https://forum.xda-developers.com/u12-plus/how-to/collection-htcu-u12-ruu-firmware-t3794664
Follow the instructions in post 4 for using an SD card.
The other option is to just run the RUU from your computer, but that may require you to grant access from the phone, not sure.
Click to expand...
Click to collapse
But will I lose the guarantee? I have imei and all that, I bought it recently, so I can still refund it or change it for a new one ..Those processes are long ... and if I make a mistake I'm sure I'll **** the phone

darbloader said:
But will I lose the guarantee? I have imei and all that, I bought it recently, so I can still refund it or change it for a new one ..Those processes are long ... and if I make a mistake I'm sure I'll **** the phone
Click to expand...
Click to collapse
Running ruu does not void warranty.

QD2DC said:
Running ruu does not void warranty.
Click to expand...
Click to collapse
can you help me in privat?

darbloader said:
can you help me in privat?
Click to expand...
Click to collapse
I can try. Pm me

Stock recovery
That's supposed to happen. Stock recovery doesn't allow you to make any modifications on the device itself. You need a custom recovery for that like TWRP, which unfortunately isn't available for the U12+ at the moment. But all you have to do to reboot the device from recovery mode is hold the power button until it reboots in to the system.
---------- Post added at 10:53 PM ---------- Previous post was at 10:51 PM ----------
umaranjum said:
That's supposed to happen. Stock recovery doesn't allow you to make any modifications on the device itself. You need a custom recovery for that like TWRP, which unfortunately isn't available for the U12+ at the moment. But all you have to do to reboot the device from recovery mode is hold the power button until it reboots in to the system.
Click to expand...
Click to collapse
Also, download mode has replaced recovery mode on any device since the HTC One M9. Prior to the M9 you'd be able to reboot etc. From recovery mode. Which HTC changed with the M9.

umaranjum said:
That's supposed to happen. Stock recovery doesn't allow you to make any modifications on the device itself. You need a custom recovery for that like TWRP, which unfortunately isn't available for the U12+ at the moment. But all you have to do to reboot the device from recovery mode is hold the power button until it reboots in to the system.
---------- Post added at 10:53 PM ---------- Previous post was at 10:51 PM ----------
Also, download mode has replaced recovery mode on any device since the HTC One M9. Prior to the M9 you'd be able to reboot etc. From recovery mode. Which HTC changed with the M9.
Click to expand...
Click to collapse
Yes, but if I restart the phone, it will ask me for the pin or the screen password, which I do not have.

QD2DC said:
I can try. Pm me
Click to expand...
Click to collapse
ok i sended you 1 pm

darbloader said:
ok i sended you 1 pm
Click to expand...
Click to collapse
I can't understand why you open 2 threads for the same problem, you must wait answer in just one of it.......and why no remove your paswword from your google account ???...i supose you have already entered the wifi from your house , that will be really easy...anyway i told you the same in htcmania....

darbloader said:
Guys I have a problem, I forgot the screen key, and now I do not know how to come back again, what I try to do is this:
1- I turn off the phone
2- I press the power button and it barely vibrates (or the LED goes off) I press VOLUME DOWN.
3. That takes me directly to the Bootloader (where I can see some htc information and little else)
4. After that I press volume down, until reboot to recovery, and there I get that
i can select too reboot to download and i get that
but whatever i enter on reboot to booloader the phone turn off and i get the bootloader menu, at this time i select REBOOT TO recovery
it appears that
and then this appears
And this is my problem here I can not enter the recovery mode, because remember that the htc u12 + can only press 1 button, that is, you CAN NOT PRESS POWER + VOLUME UP at the same time, I do not know what to do
Click to expand...
Click to collapse
I'm able to bypass the Red Triangle in Recovery mode AFTER the last system update by holding VolUP, then press Power buttons. Before the update this solution didn't work.

Help me
Help, after OTA goes to P, I don't boot into recovery stock. Before the update to P this solution work. ( The screen stops at the red triangle )

How To Guide How To: Unlock Bootloader

How To Unlock Bootloader Galaxy A12.
Code:
*** Disclaimer
I am not responsible for any damage you made to your device
You have been warned
- Go to Settings -> About phone and find your build number.
- Tap on your build number 6 times until you see “You’re now a developer”.
- Go in Developer options > enable OEM unlocking.
- Shut Down your Phone
- Hold Vol + & Vol - and Connect the USB-C Cable
- Device will boot in DOWNLOAD MODE.
- Long press volume UP to unlock the bootloader.
( This will wipe your data and automatically reboot your device! )
- After Reboot the Bootloader is unlocked.

I have done exactly this and the Samsung A12 is now in a boot loop. I have already tried the following:
- Press the power button for a long time.
- Press vol-down+power and if it is turned off only power (https://www.naldotech.com/how-to-fix-bricked-samsung-galaxy-a12-stuck-in-bootloop/)
- Vol-down + vol-up and connect C-USB
- Some variations on this.
UPDATE:
When I tried Vol-down + vol-up and connect C-USB again, it worked and I unlocked the bootloader.

jkaltes said:
I have done exactly this and the Samsung A12 is now in a boot loop. I have already tried the following:
- Press the power button for a long time.
- Press vol-down+power and if it boots only power
- Vol-down + vol-up and connect C-USB
- Some variations on this.
Click to expand...
Click to collapse
Vol-down + vol-up and connect C-USB. You can boot to download mode by this way

It’s how easy Samsung devices are OEM unlocked
1. Tap Build number 7 to 10 times ... You’re now a developer
2. Take software updates
3. Developer settings
4. Allowance of OEM unlocking
5. Start Heimdall (Odin) on desktop to tether your A12 thru USB-C
6. <Vol+> + <Vol-> to reboot to Download mode
7. Long press <Vol+> to unlock bootloader

<Vol+> + <Vol-> + connect C-USB to reboot to Download mode

Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}

Will this method work on an A12 from ATT that's SIM-locked?

..

crungtrusse said:
Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!View attachment 5320891
Click to expand...
Click to collapse
I have the exact same problem.
OEM unlock is toggled ON in developer options.
I cannot get VolUP_VolDOWN + USB to computer to produce download mode so I can unlock my bootloader. All I get is the charging battery %.
Is there any solution to this?

bouyakasha said:
I have the exact same problem.
OEM unlock is toggled ON in developer options.
I cannot get VolUP_VolDOWN + USB to computer to produce download mode so I can unlock my bootloader. All I get is the charging battery %.
Is there any solution to this
Click to expand...
Click to collapse
Same issue tmoble is trying to tell me it automatically unlocked my boot when I Sim unlocked which I'm sure is not true it didn't wipe my data for one

Has anyone tried to use fastboot and use the commands?

Also afterwards, has anyone been able to fastboot boot <kernel_initd.img> to bootstrap over USB from PC?
rob420p said:
Has anyone tried to use fastboot and use the commands?
Click to expand...
Click to collapse

xdabookam said:
Also afterwards, has anyone been able to fastboot boot <kernel_initd.img> to bootstrap over USB from PC?
Click to expand...
Click to collapse
Exactly what I ment

rob420p said:
Has anyone tried to use fastboot and use the commands?
Click to expand...
Click to collapse
I did it just got stuck saying "entering fastboot mode..." In red at top of screen
I also had the same problem as crungtrusse but when i did vol up i got a download screen that i let sit for 15 min and nothing happened
crungtrusse said:
Hi, I'm new to all this and hopefully I'm just missing something obvious. When I put my A12 into Download Mode, I have no option for a volume-up long-press, as seen in attached photo. I have an A125U model if that information is at all relevant. Developer mode is on, and OEM unlocking is enabled. Not sure where to go from here, any insight would be greatly appreciated!View attachment 5320891
Click to expand...
Click to collapse

Goldensnipes said:
I did it just got stuck saying "entering fastboot mode..." In red at top of screen
I also had the same problem as crungtrusse but when i did vol up i got a download screen that i let sit for 15 min and nothing happened
Click to expand...
Click to collapse
You always get "entering fastboot mode..." when you see that screen you are in fastboot.

LAST_krypton said:
You always get "entering fastboot mode..." when you see that screen you are in fastboot.
Click to expand...
Click to collapse
I get no response from phone at that point it dosnt even say its connected to pc

Goldensnipes said:
I get no response from phone at that point it dosnt even say its connected to pc
Click to expand...
Click to collapse
Does that happend when in fastboot? If yes install the adb interface drivers and bootloader iterface drivers.

Looking for deblooted custom rom hmu gala12

TexasAtom said:
Looking for deblooted custom rom hmu gala12
Click to expand...
Click to collapse
Nims? Maybe or do you have the files I can work with that will work too

I am also looking for mcdvoice the same. Have you got any?

[Help Fixing unusual bricked] samsung sd-t510

Hello everyone im glad to be at your presence but not for great issue.
Ive bricked my tablet, softbricked that turned into hardbricked. Long story short:
1 unlocked boot loader
2 installed twrp
3 installed wrong version of postmarketos
4 cannot boot into OS but in recovery mode
5 in recovery mode Ive updated twrp with a unstable version
6 cannot boot in recovery mode
7 cannot boot into twrp, cannot boot already into OS
8 RESULT: completly fail, not recovery mode, not twrp, not os. Only bootloop samsung logo and the message warning that the boot loader is unlocked, forever.
9 solutions failed count: pushing buttons to enter download / recovery mode, using fastboot from the pc, using adb from the pc in both cases the program awaits devices forever never showing the brick, already change usb port and cable.

your samsung device have fastboot? sure it's sd-t510?

Hello, sorry i mean sm-t510
Im not sure if it has it , but I have run it from windows as last resort to unbrick the device, I ve run adb but nothing.

Re-flash tablets's Stock ROM by means of ODIN. Requires matching Samsung's Android USB drivers gets installed on PC.

you don't need adb. you can enter odin download mode when tablet is powered off completely. hold volume down + power for ~ 30 sek to force power down. if nothing works let battery drain (may take up to ~ 7 days)
when device is powered off, press and keep holding Volume down + plug in usb wall charger until you see blue screen. then press volume up to confirm odin mode. you can now let charge for ~ 5 min
for flashing connect to PC, install drivers, use Odin3 for full flash BL + AP + CP + CSC.
Note the current bootloader level is important when flashing stock ROM. you can't downgrade bootloader, choose wise which Android version you want to flash.
for example
RP SWREV: B:5 = 5
T510XXU5CVG2 = 5
https://samfw.com/firmware/SM-T510

IT cannot, by any means login in bootloader or dowload mode. I already tried pushing and mantaining vol up + power button and any other combination.
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let it boot-loop until battery is drained (see my previous comment)

aIecxs said:
let it boot-loop until battery is drained (see my previous comment)
Click to expand...
Click to collapse
Already did that, i gets in the same loop, even I disconnected the battery , reattched it , let it run dry, just connecting the power cable. Everything went to bootloop forever until the battery run dry.

if you disconnected battery (you did open back cover?) press and keep holding Volume down + plug in usb wall charger + connect battery (in this order)
you can use a hair tie or something.
other combination for older Samsung devices: Volume Down + Home + Power
the volume keys determining boot mode are read from aboot_init() function. this is way before boot or recovery mode is loaded. if you can reach boot-loop, for sure you have passed aboot before.
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aIecxs said:
if you disconnected battery (you did open back cover?) press and keep holding Volume down + plug in usb wall charger + connect battery (in this order)
you can use a hair tie or something.
other combination for older Samsung devices: Volume Down + Home + Power
the volume keys determining boot mode are read from aboot_init() function. this is way before boot or recovery mode is loaded. if you can reach boot-loop, for sure you have passed aboot before.
Click to expand...
Click to collapse
Im for sure that I ve pushed the vol down , vol up+ power, the vol up and down combination in the exact same order you gave me and it keep looping for centuries

... then fix your volume down button
as I said odin mode is decided from sboot. it will work. unless you flashed modified sboot* with download mode forcefully disabled, like retail or MDM software.
*partition name varies abl/sboot/aboot/uboot/lk
press and keep holding before device get powered on by USB plug:
- VOLUME_DOWN and HOME keys for old samsung devices
- VOLUME_DOWN key for new samsung devices

Update: I gave you wrong advise. This tablet is bit different from other Samsung devices. as you already pointed out it requires both volume keys for download mode.
Magendanz said:
UPDATE: With the right timing, you can break out of a boot loop into Download Mode...but it's tricky:
Insert USB Type C cable connected to your PC
Press and hold the Power and Volume Down keys for exactly 7 seconds (hard reset)
Release the Power key and press and hold both Volume Up & Down keys (enter Download Mode)
If you don't see the blue bootloader unlock warning screen, keep repeating the above two steps
The trick here is that you're trying to time your switch to the Download Mode keys for the exact moment the hard reset takes effect. If you see the boot logo while still holding the first key combination, it's too late. If you switch too early, you won't trigger the hard reset.
Click to expand...
Click to collapse
https://forum.xda-developers.com/t/sm-t510-t515-2019-galaxy-tab-a-10-1-hard-resets.3927366

aIecxs said:
Update: I gave you wrong advise. This tablet is bit different from other Samsung devices. as you already pointed out it requires both volume keys for download mode.
https://forum.xda-developers.com/t/sm-t510-t515-2019-galaxy-tab-a-10-1-hard-resets.3927366
Click to expand...
Click to collapse
It took me an eternity to enter in dl mode. It is so annoying. Thank you for the pain is relieving, now i can sleep.
But, it is recognized by odin added, and is stuck in setup connection.

re-install drivers. maybe use another usb 2.0 port. try older version of Odin3.
https://developer.samsung.com/galaxy/others/android-usb-driver-for-windows
https://odindownloader.com

Now it says unknown usb device, on windows, device descriptor request failed , in device manager

same for every usb port? do you have oem samsung cable? boot linux from pendrive and double check with 'lsusb'
rufus.ie

aIecxs said:
same for every usb port? do you have oem samsung cable? boot linux from pendrive and double check with 'lsusb'
rufus.ie
Click to expand...
Click to collapse
Yes, my guess is that after 24 hours in dl mode, the tablet is going unstable

there is mentioned a timeout not sure this affect the device descriptor, though. you should see something like 04e8:685d device, without that usb connection you can't flash anything.
Now that you know how to enter download mode, should be no problem to repeat.
note there is a fork of heimdall with precompiled binaries for windows/linux you can try (in case Odin3 deny flashing even on successful connection)
https://github.com/amo13/Heimdall/releases

The thing is that the exact timing for entering dw mode is like win the lotery. I managed to enter in it only 2 times in 2 weeks. Technically is not bricked but practically it is... I cannot enter it anymore.

I believe usb port plays a role here. forget the power button, only use volume keys + usb cable to power on. maybe replace usb jack pcb board?