Develop Bugs

[Q] Can no longer get to bootloader

Hi,
Fairly new to android scene. I recently rooted and unlocked the bootloader. I'm now trying to get CWM ... but I can no longer get to the bootloader so I can enter fastboot mode. I hold down the power and the down vol key but nothing happens, after a while it just restarts the phone.
Edit: I got into bootloader by holding down vol down and power for about 5 seconds then let go of the power button and then tap the power button a few times.

Did you disable fastboot? If not it's under settings -> power.
Then try again, hold both buttons down until it appears.

I disabled fastboot. Sorry forgot to mention that in the first post. Right now I'm trying to set up ADB and see if I can do it from there, but I'm having problems doing that too.

Tried flashing Viper and now can't get to fastboot menu!

I tried flashing ViperOneM8 1.8.0 (ViperOneM8 1.7.1 -> 1.8.0) which I guess was the wrong thing (I think that was an update, should have started with 1.7.1 first). Anyway... Now my M8 boots to some type of android base OS without a lot of things...
1) It's not possible to get to settings as there is no settings app in the app drawer.
2) There is no title bar/task bar at the top. The area that holds the time, and a few icons at the top is gone.
3) There is no background.
4) There is no way to get on the WiFi do to #1 and because of this I can not add my google account. That in turn means no google play store access.
But the BIGGEST thing of all... I CAN NOT BOOT TO FASTBOOT!!!
- Power the device off.
- Hold the volume down button (also tried the volume up button) + press power usually boots strait to fastboot mode.
I THINK it has something to do with the fact that by default in the settings I need to untick the fastboot option in the dev options.. Well I can't get to settings. Now what?

arvo.bowen said:
I tried flashing ViperOneM8 1.8.0 (ViperOneM8 1.7.1 -> 1.8.0) which I guess was the wrong thing (I think that was an update, should have started with 1.7.1 first). Anyway... Now my M8 boots to some type of android base OS without a lot of things...
1) It's not possible to get to settings as there is no settings app in the app drawer.
2) There is no title bar/task bar at the top. The area that holds the time, and a few icons at the top is gone.
3) There is no background.
4) There is no way to get on the WiFi do to #1 and because of this I can not add my google account. That in turn means no google play store access.
But the BIGGEST thing of all... I CAN NOT BOOT TO FASTBOOT!!!
- Power the device off.
- Hold the volume down button (also tried the volume up button) + press power usually boots strait to fastboot mode.
I THINK it has something to do with the fact that by default in the settings I need to untick the fastboot option in the dev options.. Well I can't get to settings. Now what?
Click to expand...
Click to collapse
Shut down phone.
Turn it on
Hold volume up+power button until it restarts
As soon as you get the black screen for restart release power button and hold volume down.
If your timing is right you will enter bootloader.
I tried it and it definitely works
Flash your nandroid or any rom you know was ok to begin with and you are up and running!!!

stathis95194 said:
Shut down phone.
Turn it on
Hold volume up+power button until it restarts
As soon as you get the black screen for restart release power button and hold volume down.
If your timing is right you will enter bootloader.
I tried it and it definitely works
Flash your nandroid or any rom you know was ok to begin with and you are up and running!!!
Click to expand...
Click to collapse
Tried that...
1) Powered off device.
2) Held power button for about 2 seconds until it came on then let go.
3) IMMEDIATELY I pressed and held down the power and volume up buttons.
4) The phone continues to boot up a little bit longer and gets to the verizon check (verizon splash screen) then shortly after goes black (as expected).
5) IMMEDIATELY let go of power button continuing to hold volume up button.
... .. .. .
6) I get the white screen that says HTC (powered by android)... NOT a bootloader screen as expected.

Update... When I try to click on the app drawer then top right click the little three dots, I try and "Manage Apps" ... ERROR "App isn't installed"...
:/

arvo.bowen said:
Update... When I try to click on the app drawer then top right click the little three dots, I try and "Manage Apps" ... ERROR "App isn't installed"...
:/
Click to expand...
Click to collapse
If you connect the phone to the computer, can you get fastboot or adb to recognize the phone?
If so, you can try adb reboot bootloader command or fastboot reboot bootloader comand

arvo.bowen said:
Tried that...
1) Powered off device.
2) Held power button for about 2 seconds until it came on then let go.
3) IMMEDIATELY I pressed and held down the power and volume up buttons.
4) The phone continues to boot up a little bit longer and gets to the verizon check (verizon splash screen) then shortly after goes black (as expected).
5) IMMEDIATELY let go of power button continuing to hold volume up button.
... .. .. .
6) I get the white screen that says HTC (powered by android)... NOT a bootloader screen as expected.
Click to expand...
Click to collapse
After 4 you release power button and press volume DOWN.
This will get you to the bootloader

stathis95194 said:
After 4 you release power button and press volume DOWN.
This will get you to the bootloader
Click to expand...
Click to collapse
Yea, I ended up doing the following...
1) While device is powered on, Press and hold Volume Up + Power until device reboots.
2) When it starts to reboot continue holding the Power button and change to the Volume Down.
That worked for me.

Not working power button and recovery with "no command." issue

Hi all, have two problems:
1) My power button stopped working long time ago. But it's some mysterious. It doesn't turn off or on screen and it doesn't accept options in bootloader. But it DOES reboot tablet if I hold power button.
I was trying to clean button with alcohol and make it work, but nothing helps. I think that button replacement won't help (I didn't try).
2) I wanted to install new ROM, but I can't. I stopped after flashing recovery, 'cause "No command."-screen appears, where I should use my NOT WORKING power button.
So my questions are:
1)any suggestions about the problem with power button? (Solution of this problem will solve second problem)
2) how to enter custom recovery without using power button if I had "No commans." stock recovery screen?
Thanks a lot!

Type "adb reboot recovery" from inside Android. Same for rebooting to fastboot or bootloader. It's easier, especially on the Pixel 2, than trying to get button presses correct.
If you can hold the button down and reboot it's apparently working physically.

fr4nk1yn said:
Type "adb reboot recovery" from inside Android. Same for rebooting to fastboot or bootloader. It's easier, especially on the Pixel 2, than trying to get button presses correct.
If you can hold the button down and reboot it's apparently working physically.
Click to expand...
Click to collapse
Thanks for quick reply.
Yeah, I enter recovery by "adb reboot recovery", but I have then "No command." screen where I need my power button to skip this screen and enter TWRP.

I've not seen that screen with TWRP, only with the stock recovery.

AlexImago said:
My power button stopped working long time ago. But it's some mysterious. It doesn't turn off or on screen and it doesn't accept options in bootloader. But it DOES reboot tablet if I hold power button.
I was trying to clean button with alcohol and make it work, but nothing helps. I think that button replacement won't help (I didn't try).
Click to expand...
Click to collapse
Interesting. I opened my N7 to check the buttons connector's configuration. Please verify the following:
disconnect the battery and measure pin 1 and 8 with an ohmmeter while pressing the power button - I get <1oHm (short)
reconnect the battery and measure voltage on pin 1 - I get 4.0V
Well?

fr4nk1yn said:
Type "adb reboot recovery" from inside Android. Same for rebooting to fastboot or bootloader. It's easier, especially on the Pixel 2, than trying to get button presses correct.
If you can hold the button down and reboot it's apparently working physically.
Click to expand...
Click to collapse
k23m said:
Interesting. I opened my N7 to check the buttons connector's configuration. Please verify the following:
disconnect the battery and measure pin 1 and 8 with an ohmmeter while pressing the power button - I get <1oHm (short)
reconnect the battery and measure voltage on pin 1 - I get 4.0V
Well?
Click to expand...
Click to collapse
Have the same with yours

Need Help with ADB [Volum Up/Down + Power button BROKEN]

My ADB is On in settings and I can use ADB normal. But when my Phone is off I can't turn it on anymore the only way would be with ADB command: ADB reboot devices!
Power button + Volume UP/DOWN isn't working anymore...
The thing is, when connecting my Phone to my PC after it gets off it will show the charging animation. And when my phone reached 100% it stays in the animation and doesn't boot up. ADB isnt working in that state.
How can I boot my phone?? Pls I hope someone can help me PLS PLS

You must try conclude pins on motherboard for button volume up when you connecting USB cable, after that fastboot was started and you can type fastboot reboot command on pc.

my volume up button broken and i need that to flash stock rom again as phone in bootloop and cant access recovery,phone boots and shows logo for 1 sec and reboots again any ideas plz i flashed the oneos rom

ireaper4592 said:
my volume up button broken and i need that to flash stock rom again as phone in bootloop and cant access recovery,phone boots and shows logo for 1 sec and reboots again any ideas plz i flashed the oneos rom
Click to expand...
Click to collapse
If you have power and volume-down buttons functioning, boot the phone with the power button and when the bootloader unlocked warning comes up, press the volume-down button and you will get the options for restart, fastboot, recovery etc. Simply choose what you want with the volume-down button and confirm with the power button.

tnsmani said:
If you have power and volume-down buttons functioning, boot the phone with the power button and when the bootloader unlocked warning comes up, press the volume-down button and you will get the options for restart, fastboot, recovery etc. Simply choose what you want with the volume-down button and confirm with the power button.
Click to expand...
Click to collapse
yes got that problem is i need volume up button to work so i can put in adb mode so i can flash stock rom,i decrypted my devices then installed the oneos rom and thats when i lost access to recovery and goot into bootloop?

How to reliably start TWRP

I have TWRP installed, and have managed to run it a few times. Now I cannot start TWRP at all.
From off, if I switch on, the following happens:
1) Screen with Samsung Galaxy A70 - Secured by Knox
2) 0.5 seconds later another screen, "this phone's bootloader is unlocked and it software integrity. .." and "press power key to continue..."
3) 5 seconds later, same screen as (1)
4) 3 seconds later, red letters "this phone is not running Samsung's official software"
5) 3 seconds later blank screen with "samsung" and then booting to android.

In my experience I have to flash twrp every time I want to use it( I don't know the reason but I couldn't fix it ) , for booting twrp on the other hand I turn off the phone first, then I press power button+volume down until the "this phones bootloader..." screen appears, here is the tricky part, you have to quickly let go of these two buttons, press power button, let go of the power button (after the warning disappeared) and then press volume down button (and hold it) until twrp logo appears, this happens really fast so you may need to do it a few times to get used to it.

mobin22 said:
In my experience I have to flash twrp every time I want to use it( I don't know the reason but I couldn't fix it )
Click to expand...
Click to collapse
Yes, same here, the only time I have managed to run TWRP on this phone, is right after a flash.
mobin22 said:
and then press power down button
Click to expand...
Click to collapse
Do you mean volume down?

Zilliman said:
Yes, same here, the only time I have managed to run TWRP on this phone, is right after a flash.
Do you mean volume down?
Click to expand...
Click to collapse
Power off the device, plug into a pc, wait for it to start charge, hold vol up and power till it turns on. Wala boots to twrp. If you have magisk installed,you can use the reboot option within magisk.

mobin22 said:
In my experience I have to flash twrp every time I want to use it( I don't know the reason but I couldn't fix it ) , for booting twrp on the other hand I turn off the phone first, then I press power button+volume down until the "this phones bootloader..." screen appears, here is the tricky part, you have to quickly let go of these two buttons, press power button, let go of the power button (after the warning disappeared) and then press volume down button (and hold it) until twrp logo appears, this happens really fast so you may need to do it a few times to get used to it.
Click to expand...
Click to collapse
Samsung changed how to enter recovery on Android 11. Power off device, plug into pc, wait for it to charge, then hold vol up and power till it turns on. Alternatively, if you have magisk installed, use the reboot options within magisk.

I did that. Thanks!
But it has gone to:
Android Recovery
Samsung /a70qxx/a70q
11/RP1A.200720.012./A705FNXXUB5DVB3
user/release-keys
Use volume up/down and power.
Reboot system now
Reboot to bootloader
Apply update from ADB
Apply update from SD card
Wipe date/factory reset
...
...
...
Where is TWRP? It seems it's gone.

Zilliman said:
I did that. Thanks!
But it has gone to:
Android Recovery
Samsung /a70qxx/a70q
11/RP1A.200720.012./A705FNXXUB5DVB3
user/release-keys
Use volume up/down and power.
Reboot system now
Reboot to bootloader
Apply update from ADB
Apply update from SD card
Wipe date/factory reset
...
...
...
Where is TWRP? It seems it's gone.
Click to expand...
Click to collapse
That's because you're not installing it properly go back to my guide and follow it exactly and stop listening to these other people. I've been modding this device since it first came out with Android 9, I know every inch of this device. You're getting confused by what other people are telling you

MarvinMod said:
5- Press and hold vol down and power till the screen turns blank then immediately press and hold vol up. The device will reboot then land you in the twrp splash screen
Click to expand...
Click to collapse
It fails here, on this step. After successful flash of recovery.tar, power + vol down to reboot, cable still connected, nothing you can do now can bring TWRP up. The phone boots into Android.
EDIT: I think I have now got it. I will update in a few mins.

Zilliman said:
It fails here, on this step. After successful flash of recovery.tar, power + vol down to reboot, cable still connected, nothing you can do now can bring TWRP up. The phone boots into Android.
EDIT: I think I have now got it. I will update in a few mins.
Click to expand...
Click to collapse
After successful flash of recovery.tar, power and vol down to reboot, as soon as the phone screen goes blank, immediately release all keys and press and hold vol up. Must be as soon as screen goes blank. The device will then reboot twice and land you in twrp splash screen. You must hit vol down and power after successful flash then when screen blanks, vol up. If you miss this step, twrp will not hold and revert back to stock recovery.

Here is the notes I made today:
****************************************************************
INSTALL + START TWRP
phone is off
press up + dn
insert cable
go into download (press up)
ODIN 3.14 + AP:tar(vbmeta.img+twrp.img), auto reboot off, press upload
when it succeeds, press dn + pwr until it reboots
then quickly up + pwr until it starts (no need to hold down)
this starts in TWRP
from powered off
press pwr button
goes into twrp or android(system) -- depending on what was used last time
if we used reboot->system last time it will now **Always** go into system!
to go back into twrp:
switch off
power cable until charge
pwr + up until it starts
****************************************************************
The above means that you CANNOT go back to TWRP unless you have a cable and a PC near by.