i have accidently disabled usb in bios and now i want to reset the bios or enter into the boot menu. is there any key combination without keyboard.and os is also not booting up.Or bios chip should be replaced.please suggest.
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Hi,
a friend gave me a "broken" Nexus7 which is in a boot loop since she tried to flash Ubuntu on it. But I got stuck because I cannot enter fastboot mode.
When I start the Nexus 7, it shows the Google logo (with closed lock symbol). After approximately 15 seconds the Ubuntu start screen logo appears. After another 15 seconds it reboots.
I already tried the following:
1.) Entering fastboot mode by starting with power button & volume down -> boot loop
2.) Make sure it's really a fresh start by opening the tablet, removing the battery cable, connecting the battery cable, trying to enter fastboot mode
3.) Connecting it with my PC (running on Linux) and trying to issue commands to the tablet:
lsusb shows vendor and product id, so it kind of recognizes the tablet
adb devices shows a serial id + "recovery" during the time in which the Ubuntu logo is displayed
I cannot enter any adb commands -> error: protocol fault (no status)
fastboot devices shows no device in any of the stages of boot loop
Interesting thing is that in Ubuntu the only possibility to power off the device is pressing the volume up key for a few seconds.... the power key doesn't do anything anymore if the device is during its boot loop...
There must be a bootloader, otherwise it would not try to load Ubuntu. Maybe the recovery bootloader (fastboot) got somehow overwritten?
Can I do anything else in software, or do I have to replace some hardware to make it work again?
Guys #help me.. #zenfone5
i forgot my pattern lock and i am not using google account
i cant enter into fastboot or recovery mode, when i use volume key combinations its boots only.
my laptop not recognizing the device, i have installed all the drivers..
any way to reset ?:crying::crying:
This is just a collection of tricks I have learned since owning my SM-T560NU:
Force Shutdown
While not recommended, there may be times in which you need to forcefully shutdown your tablet, such as a bad OS crash, or a bootloop. Most devices allow you to do this by just holding the power button. However I have found with my SM-T560NU, you must hold Power + Volume Down for about 5-7 seconds to trigger the force shutdown. Actually, this reboots it, which leads me into the next tip.
Recovery Mode
It is a common misconception that you need to hold Power while entering recovery mode or download mode. This is not the case. The actual keys for recovery are just Volume Up+Home. To try it yourself, tell your tablet to reboot normally from the OS, then hold these keys. You'll see it boots recovery, without needing to press power at all! The trick is to be holding the buttons when the bootloader boots. The power key is not needed at all unless the device is completely off.
Download Mode
Same as above, but Volume Down+Home.
Unlock Bootloader
If you are here on XDA, you are likely interested in customizing your tablet with a custom ROM, Kernel, or recovery. But it is important to remember to unlock the bootloader before attempting any customization. You can do this by enabling developer mode in Android (go to Settings, About, and tap the Build Number 8 times). Once enabled, go to the developer options (near About on the main settings) and near the top there will be an option to unlock the bootloader. This only needs to be done once. If you install a custom ROM or factory reset (via custom recovery), the "Unlock Bootloader" option may revert to "off", you do not need to enable it again. If you factory reset while still on the stock ROM, you may have to re-enable it, as Samsung's recovery may re-enable the bootloader lock. This is untested.
I changed my battery and now it only goes to the Reboot bootloader screen. The arrow keys don't work to change the menu. Sometimes I can get it to Recovery mode, but neither the power key or arrow keys will work. Once I got it to the Start, but the power key did nothing. I have it on the USB port, but ADB devices returns no devices, so even though I installed the Google USB drivers in Android Studio I can't get the computer and the Nexus to talk to each other. Any other ideas of what I can do?
Deal All,
My first goal (before rooting, try custom rom etc.) is to update with official rom from Android 4.4.2 to 5.0.2.
Samsung Kies ask me to use SmartSwitch which said "your device can't be upgraded" or something like that.
As said in title, I cannot enter in download mode. Pressing Vol+ Home and Power display the usual warning message, Vol+ to continue / Vol- to cancel.
Pressing the Vol+ just reboot the tab.
Entering Recovery Mode work fine with Vol- Home and Power.
I found some info about an eventual "OEM lock" to turn off. I followed instruction but no way, no "OEM lock" appear in Dev menu...
The tab as been wiped thanks to the recovery mode.
Any idea?
Thanks!
Edit: Resolved, it was a faulty volume button
i had th same thing but on lte version i just went to settings, delevoper options, end unlock bootloader or smthing like that it magically started working
Thanks for your reply. Basically those are instructions I followed without success:
1 - Turn off the phone.
2 - Turn on the phone by holding down the volume up button.
3 - The phone will enter official recovery mode.
4 - Wipe cache partition.
5 - Wipe data/factory reset.
6 - Reboot system.
7 - Log in to your Google account and your Samsung account.
8 - Go to settings and enable developer mode.
9 - Enter developer mode, enable "OEM unlocking" option.
10 - Now you will be able to enter the DOWNLOAD mode
I can't find any settings in dev mode meaning "OEM unlocking" or "unlock bootloader"...
I tried also to communicate with Odin, but the tab is only detected in regular mode, not in recovery mode.
I know it's kind of old device, but I can't be the only one, a solution should exist...
Ok, so it's resolved, and was even more stupid than you may think: my physical volume button was faulty and didn't catch each time when I pressed Vol+ or Vol-. Using a small tool did the trick.