Questions tagged [boot]

Use this tag for issues with the "boot-process" of your Android device.

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5 views

Samsung A20 SM-A205W stuck on download mode

I have a Samsung Galaxy A20 and I was attempting to unlock the bootloader and also install TWRP. While the bootloader was unlocked successfully, while doing the TWRP part I had to use Odin and used an ...
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9 views

Add a custom script in init.rc in a Custom ROM

I am trying to add a script in a custom ROM on a Galaxy Note 4 I've done the unpack and repack process on boot.img by modifying the init.rc file. But every time I try to reboot it stops at the home ...
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27 views

How to enter recovery mode with an OTG keyboard?

I would like to know how to boot my Mediatek tablet into recovery mode by using a physical keyboard (OTG) because my volume key doesn't work. And I can't boot to the OS to enable the USB debugging.
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Can I give permanent volume increase permission to my phone?

I use Android 7.0. My phone asks a permission about increasing volume level after every boot if I want to increase the volume level. Is doing this mandatory after every boot or can I disable/by-pass ...
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22 views

LG G3 D855 with lineageos: hangs while booting, recovery partition damaged, no connection from adb

I accidently damaged the recovery partition on a LG G3 D855 with Lineage15.1 OS was still booting ok, but I wasn't able to get TWRP on recovery again, as the device was not routed. I used a one-click-...
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45 views

Encryption failed after turning my android phone on

when i turn on my phone it shows "Encryption failed" and "Unable to start up your device. the encryption process was interrupted. you need to reset your device to factory default setting. this will ...
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35 views

Unpacking and repacking boot.img changes it's file size

So I unpacked boot.img file using unpackbootimg in ubuntu. Then without changing the file I repacked it. But the filesize became smaller. From 36.7 MB to 17 MB. I tried to flash that image to my phone....
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1answer
62 views

SELinux always set to permissive, how to set enforcing permanently?

I flash a custom ROM to my HTC B2UL. The ROM, by default, has the SELinux policy set to Permissive instead of Enforcing. I can use adb shell setenforce 1 to make SElinux enforcing. But after reboot, ...
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1answer
53 views

How to disable bad RAM addresses and fix bad storage blocks?

The symptoms which device presents are: Restarts randomly with a previous freeze of a few of seconds (this is becouse of /proc/sys/kernel/panic is set to 5). Sometimes with a blue filled screen. Even ...
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23 views

How to exit out from a stuck safe mode?

My Samsung Galaxy A3's power off button didn't work, so I held the Power off and Home key for 5 seconds which brought me to a custom OS warning. It showed that I could cancel and restart if I pressed ...
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1answer
69 views

ST21i Removed boot flag

I was trying to boot from the sdcard, as I thought it was a boot order issue, I disabled the boot flag on the boot partition. Now my phone will not turn on, or enter bootloader. I have found various ...
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9 views

How do I unfreeze my LG L15G sunrise?

I keep trying to turn it on and at first it just got stuck in a boot loop, so i factory data reset it and after the reset when it boots itself up it freezes on the LG powered by android screen. I have ...
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23 views

Is there anything like live CD for android phones?

We can go into recovery mode in android phones, which is usually home+volume up+power for samsung phones This answer says that the recovery mode is like a simple OS that the device boots into. This ...
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17 views

what does ddi stands for in android os?

What does ddi stand for in android OS? My phone g532f couldn't power on, but enter download mode just by using "jig USB" !!.. this message appears in download mode. ddi read failed (in rad color) ddi ...
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17 views

Reading phone partition and writing to SD Card

Guys i really need HELP Mine Docomo S7 from Japan aka SC-02H is bricked, so No Download - No Recovery - Not Turning ON I found another SC-02H working one from mine friend - I Read somewhere that i ...
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1answer
14 views

itel phone unable to switch on

I bought a new itel phone yesterday. I charged it a bit then added apps and photos and music. I played some music during the night. I tried rebooting does not go on, it vibrates but screen is blank.
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22 views

Unable to have applications run on startup Android 7.0

I can't seem to get any applications to start at boot. I wanted sshd to run at startup so I installed "Termux", "Termux:Api" and "Termux:Boot" and followed the instructions and placed the startup ...
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1answer
18 views

Apps suddenly stopped starting automatically when my phone boots

I have two apps that I expect to start when I boot my phone: AccuBattery and Weatherbug. A few months ago though, Weatherbug stopped starting automatically, and AccuBattery stopped a couple days ago. ...
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18 views

Nexus 7 not booting past google screen

I tried to factory reset my Nexus 7 this morning and it took 4+ hours, it stayed on the "erasing" screen so I got bored and turned it off, I figured no factory reset takes that long. Now when I try to ...
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1answer
249 views

E: can't mount/cache/recovery/log on Android Lenovo a1000

I have a problem on starting my lenovo a1000 , so i decided to install firmware on it. I tried too much, but every time the phone fishing flashing , and 100% passed with spd factory flashing tool , ...
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317 views

My Samsung Galaxy S8 has crashed and will not go through the forced restart procedure

My Samsung Galaxy S8 has not suffered any water or impact damage. It just stopped working all on it's own. I have tried to go through the forced restart/reboot procedure - ie - holding down the power ...
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1answer
98 views

Armv8 image stuck on booting process

I can't make it to boot an armv8 image (API24, Nougat, Android 7.0) to boot successfully in Android emulator. The Emulator software was updated today to the latest version. The first problem I can ...
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1answer
29 views

Power on when charging but only when battery level is greater than 20%

I have recently tried to fit a tablet into my car and I came across a problem with waking up the device without using the power button. My solution is to boot the device whenever it is charging, but ...
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2answers
133 views

Redmi 3 stuck on bootloop with no recovery mode access

I have a Redmi 3 MIUI7 that I recently flashed with MIUI9 using TWRP. Right after flashing, I tried to boot it but it stuck on a bootloop. Since I haven't booted into the ROM and can't do so because ...
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1answer
51 views

Link between device state & user settable root of trust

I am (still) trying to understand exactly how verified boot works and I am wondering what happens when a user-settable root of trust is used by the device. As said here: If the device is LOCKED, ...
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1answer
27 views

What do options on this error mean?

I have Acer E39 phone (Android 4.4.2) that has 3 SIM. Today, when turned on, it didn't start normally but instead, I got the following options. What does each of the options mean? How do I debug ...
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1answer
73 views

Why is there “/proc/net/snmp” file on my device? Could it be due to a malware?

After reading this paper I observed a little and I realized that an SNMP socket (exactly two: v4 and v6) exists when I use ls /proc/1/net. I see them clearly. My question is simple, do the bootkits ...
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2answers
77 views

Fixing a kindle fire X43Z60

So I have a Kindle Fire. One day I was stupid and deleted a bunch of stuff in the /system folder. Now, it no longer boots. No ADB, no fastboot, no nothing. However, it still shows the static boot ...
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20 views

I am in stuck with rebooting Samsung S5 in normal mode rather than recovery mode. How to fix?

Consider the following thing first: My Power Button doesn't work at all. My phone was on and I connected the phone with PC and ran the following command in adb adb reboot recovery Then it opened ...
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1answer
319 views

Can't Flash Google Factory Image - No Boot Partition

I seem to have bricked my phone but thankfully the bootloader is unlocked so I'm sure there is a way to fix it. I am having a hell of a time though, I think I need to re-create the boot partition ...
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22 views

Asus not able to charge or boot

I have a strange problem. My device is Asus Zenfone Max ZC500KL. I have a LineageOS (forgot the version but Android 7 or 8 I think) on it. The battery is drained and at 0%. And as soon as I plug it ...
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1answer
31 views

Where do the exact locations of the phone buttons combinations stored?

Where do the exact location of the phone button combinations like power reset while holding Volume down + Power, booting to recovery by holding Volume up + Power + Home (if there is a Home button) is ...
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1answer
186 views

Huawei Ascend Y530 will not boot

I have a huge problem with my Huawei Y530 cell phone. Today I received a phone call, but instead of actually ringing, it just vibrated once, and an error message popped up saying something along the ...
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1answer
40 views

Prevent homescreen/desktop from showing before my start-up app?

I have this bootup app that listens to the system boot up event and will launch on system start up (pardon the verbosity). Problem is, the system will stubbornly show the homescreen (or a static ...
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31 views

SM-G130E phone is not booting after the Samsung Logo (Samsung star Duos 2)

This icon (!) comes when im trying to hard reset by Volume up + Home + Power. Any solution?
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127 views

Access file in sdcard from init.rc

I need to copy a file from the external SDcard to a location in the root partition, during the boot process (from init), after /data is mounted. I used Carliv's tool to add the following line to init....
2
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1answer
227 views

actual limitations of locked bootloader

I have read in many posts that a locked bootloader prevents from flashing custom ROMs, because it checks the digital signature of the ROM itself. I thought a "bootloader" was only responsible for ...
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1answer
96 views

What position do cellular communcation (1G, 2G, 3G, 4G or other function only implemented in phone) play in Android operating system archtecture?

I am entirely new to Android, but have a little knowledge on Linux. I have view the architecture graph of android on official site: The Problem: Not all android device support cellar network. As a ...
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2answers
38 views

Stuck in system recovery

I have a hTC D626w, after an interrupted update, it does not boot any more. When I enter recovery mode, I see the following message at the bottom of the page: No file end with factory_update.zip ...
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1answer
656 views

System crashed and not rebooting on Xiaomi Redmi 5 Plus

I have a Xiaomi Redmi 5 Plus with MIUI 8. My system crashed today and then the phone tried to reboot but is stuck eternally in the boot screen with the Mi and Android logo. I only had 100 MB free ...
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0answers
22 views

Asus Nexus 7 2013

This is brief, my original was to big. Unit was working perfectly. Over a month deleting & uninstalling. Next boot displayed "UI" with system hung, only option shut down. Every boot after ONLY ...
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1answer
258 views

OnePlus 5 Black Screen after Pie

My OnePlus 5 after the Pie OTA update wont show the screen. after rebooting, it only shows the 'android' logo and then the screen goes completely blank(black). I can sense that the phone is turning on ...
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0answers
271 views

Can't unlock my phones bootloader

I'm using a local branded chinese phone. And my phones comes with locked bootloader. As it is a local branded phone, manufacture doesn't provide a official way to unlock it! I've tried many way I ...
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1answer
2k views

How to fix a phone stuck at firmware update screen?

My phone was dead so I plugged it in to charge. I attempted to turn it on and saw: Firmware Update Do not unplug the USB connection until the process is complete. This was all it showed and ...
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0answers
49 views

Cool 1 C103 stuck in twrp

I installed the twrp from https://forum.xda-developers.com/cool1/how-to/guide-easy-twrp-root-using-qfil-eui-t3781171 and then tried to install unofficial lineage 15.1 followed by Gapps. I probably ...
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1answer
4k views

How to fix device when stuck in firmware update with “Do not disconnect USB” message?

I have an LG Android phone. When I turned it off last night, it turned itself back on again with the firmware update showing "Do not disconnect USB". But when I received it from my contract holders, ...
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1answer
61 views

Android 4.2 - how execute shell command on system boot? [duplicate]

How do I do that? I have root access and the it's a custom build of AOSP project.
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1answer
523 views

How to root Exynos S8 SM-G950F?

I have rooted devices before: an A3 2016 and a Note 3 Neo. I don't remember the exact procedure, but it was quite effortless. Now I have an S8, the SM-G950F variant to be precise, and everyone states ...
3
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1answer
372 views

How does android dm-verity protection validate blocks with hash tree

I am learning about android dm-verity protection and I try to understand how does the android dm-verity uses the hash tree for validation of "single block". https://source.android.com/security/...
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1answer
130 views

How to know why is my Nook unable to boot into ClockWorkMod?

I have a Nook Simple Touch that is already rooted. I've used the Clockworkmod file that I downloaded from the XDA-developers website here. These are the steps I followed: I connected my device to my ...