My LG G4 is dead. Maybe CPU, maybe ram... don't know what, but suddenly it can't start anymore. It can display LG logo and then stop. I can enter in TWRP with sequence Power+Vol Down, but after a while in recovery, the phone freezes and reboots. So I can't try to reinstalla a rom or other things.
I tried to enter in download mode and restore kdz original rom with LGUpdate, but when it starts to transfer data, everything stops working.
So, my phone has warranty until October the 10th and I want to try it. But I need to relock bootloader. But to do it I need to enter in bootloader and then in fastboot. I can only do this with hardware buttons, but I can't do. I'm trying this way: press vol up and power button, then when LG logo appears, I relase power for a second and then press it again. But the phone starts the boot entering the LG boot animation and than dies.
So, wich is the right procedure to enter bootloader and fastboot?
AFAIK there are only 2 modes you can enter from Hardware button combinations:
Factory Reset/Recovery by Vol Down + Power until LG Logo then release and re-press Power.
Download Mode by Powering off the device and holding Vol UP while connecting a USB Cable .
Fastboot will only work if Allow OEM Unlock Setting is checked from Developer Options.
So even if there were a hardware option for this, without that setting enabled Fastboot Mode will just reset the device.
Your Device definitely sounds like it has the bootloop issue that LG should fix under warranty.
Many people suggest putting the device in the freezer, I personally dislike this issue due to the fact that electronics and moisture do not work well together.
I removed the back from my phone and the battery and heated the device with a hairdryer for around 5 minutes before replacing the battery and booting the device into recovery.
This allowed me to boot the device long enough to backup all of my files, flash a KDZ and re-lock the bootloader.
There is even a post for the bootloop issue which you likely have with all you need to know.
Just check my signature
sfX
Sent from my LG-H815 using XDA Labs
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I was provided this device to try and help resolve the issue. I am not sure how it got to this point. I believe that it was rooted with a custom ROM, then the individual tried to install a stock ROM (method unknown).
The current situation is:
Galaxy Tab S 10.5 SM-T800 stuck in a bootloop with the TWRP logo on the screen. I can not get the tablet to go into download mode. I have tried all of the different methods to enter download mode, i.e. Power & Vol - & Home, Drain the battery > Plug into PC while holding Vol - & Home, Power & Vol + & Vol -. None of these combinations do anything. The only thing I can do to get a response is to press Power & Vol +, which reboots the device right back into the TWRP loop after the Samsung Logo. Power button alone does nothing.
The device is seen by Windows with the Samsung Drivers but is not mounted to a drive letter, and I can not mount it.
ADB , fastboot and Odin do not see the device.
I would like to flash a new rom either custom or stock, but I need to be able to get the device into download mode so it can be seen by odin.
Any help would be great.
Mike
Probably just timing and pilot error this one. I've never known of any Samsung device boot but be incapable of booting to download mode as download mode is bootloader related.
No working bootloader means dead device.
No matter what state the device is in at the moment with the usb cable removed, hold POWER + VOL DOWN (not up) + HOME until the Samsung boot logo comes up, hold for another couple of seconds then release. Download mode should appear.
I know it should be easy....
I know it should work but it is not, I will make a vid of the process and post. I can not make heads or tails.
Mike
ashyx said:
Probably just timing and pilot error this one. I've never known of any Samsung device boot but be incapable of booting to download mode as download mode is bootloader related.
No working bootloader means dead device.
No matter what state the device is in at the moment with the usb cable removed, hold POWER + VOL DOWN (not up) + HOME until the Samsung boot logo comes up, hold for another couple of seconds then release. Download mode should appear.
Click to expand...
Click to collapse
Is the home button actually working, are you pressing it firm enough?
If the home button doesn't register then the tablet will simply reboot.
Its a bit odd why twrp doesn't fully boot though unless it's the wrong one.
Does it hang at the twrp logo or continually reboot?
Today I installed magisk with the help of this guide https://forum.xda-developers.com/lg-g8/how-to/rooting-g8s-guide-t4044193 . It worked and I had root access. After some hours I restarted my phone and now it's in bootloop. It can't shutdown and it's restarting endlessly (pressing the power button for 20 seconds shut it down but it immediatly restart). I can only enter the hard reset menu (by holding volume down and power button, is there a combination for recovery mode with volume up?)
I know I need a way to enter fastboot mode to reflash the normal boot partition from the original kdz or the entire kdz but I can't. neither adb devices or fastboot devices finds the phone and the phone it's not in recognized by the PC so no COM port assigned. Tried to follow this https://www.mylgphones.com/lg-g8-th...nbrick-restore-lg-g8-thinq-back-to-stock.html
Update: I entered the fastboot mode. I plugged the usb-c cable while clicking the volume down button while the phone was off. Now I will try to flash the boot_a.image from the original kdz file
Flashing the original boot_a.image worked. I will now try to understand why this happened
After unlocking the bootloader, such a message appeared, I know that this is normal, but I can’t log in, I’m just being thrown from fastboot back to it, I don’t want to do recovery yet, maybe it can be fixed, there are some ideas how to enter in 9008 (EDL) to deliver native abl_a and abl_b?:crying:
press and hold power and vol down button and when the phone reboots and black screen appears keep pressing vol up button and if u have correct drivers installed for this mode than it will appear in device manager but your phone will stay blank. here u can use qfil to restore your files back.
Hi everybody, yesterday I was playing with my old Galaxy A50 trying to install a custom rom unsuccessfully.
I repeated the procedure three times installing TWRP and then Havoc OS but every time I tried to reboot from TWRP to OS I was stuck at the warning screen saying that the phone bootloader was unlocked and booting into download mode to reflash TWRP was blocked as it showed "only official binaries can be installed" (yes I installed Samsung disabler but still).
Still I was able to get the phone into download mode and reinstall the stock firmware as it seemed to be the only way to install and boot TWRP.
But at 4th time repeating the process I got frustrated, shut down the computer and left the phone on the warning screen still connected to computer usb cable.
Then I got back and noticed the phone was off as the battery died.
Indeed the battery died, so I put the phone in charging and after it reached 100% I tried to boot into download mode again to reflash stock firmware.
But here's the strange thing, I cannot boot into download mode anymore as pressing vol up+vol down while connecting usb cable, shows the lightning charge logo for 5 secs and then reboots infinitely with the same pattern.
If I force reboot by pressing vol down+power it shows the Samsung logo with the warning below it, then skips to another screen with another warning suggesting to press power button to continue (which does nothing) and after a while reboots to samsung logo.
So it doesn't seem it is bricked, it looks more like a battery controller fault, so I tried to detach the battery flex from the board, hoping it would reset the controller but it's still the same.
Also I tried with the flex detached and still no download mode is possible.
Was the download mode somehow erased? (if it's even possible considering it's the motherboard firmware)
If you need photos, videos or even a call on zoom, Skype, webex I would be glad to show you
same i got the same problem i can't find nothing for this when i press volume up and down and put the otg cable its simply charges but it gets stuck on the logo image there's no way to fix this but the only way is to open the phone,change the emmc and put one from samsung,close the phone flash a custom rom and you are done.
If you can enter recovery, do it. As soon as your phone gets into it, select the power off variant and then try to enter the download mode.
It seems like you did not unlock the bootloader, did you?
The bootloader Is unlocked i can't enter in the recovery because the phone locks on charging logo and its fully charged but when i try without charger It doesn't start.
I've bricked my g8 a long time ago.
If i recall correctly, custom rom caused it to bootloop.
And i accidentally wipe all of the partitions.
Could anyone share a copy from their phone?
Also it doesn't react to pc anymore, drivers doesn't help too.
Well...com6 appears for a few sec when booting, but quickly disappears.
I am not sure if i forgot how to enter edl mode.
But if not that's not working as well.
neither is download mode.
Any ideas?
Sorry, no backup to share, but a couple of suggestions...
1. Recovery from a brick, including a scenario with totally wiped out partitions - this should guide you step by step through the process:
https://forum.xda-developers.com/t/tutorial-rescue-from-hard-brick.4351389/
2. EDL mode (saved if from one of the guides a while ago, both options worked for me):
Hold Vol- and Power together, when the phone screen turns off to restart begin quickly pressing the Vol+ but keep holding Vol- and Power.
Here is a youtube video of how to boot to EDL:
Alternatively, with phone off, plug in usb cable and wait for the charging symbol to start flashing, then hold Power and Vol- together and start tapping Vol+. Sometimes it's easier that way.