Question: How does android boot up process work? - Android Q&A, Help & Troubleshooting

I want to know how does it actually work. What partitions are loaded in first, how many steps does it take from power button press to fully booted android screen? I have a M31S phone running Android 11 with screen stuck on first logo but it boots fine and works even touch but the screen is strangely stuck on first logo screen which I find very odd. Download mode and recovery modes(Twrp works too) work just fine.
I just want to know more about the process of booting up to the system.
Thanks!

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Boot loop/Can't acess rccovery - After flashing Desire 816 DUG firmware to fix WIFI

Hi all,
After Flashing my phone with this rom
http://forum.xda-developers.com/desire-816/development/rom-official-marshmallow-htc-desire-816-t3323367/page36#post68415244
needed to flash this firmware
http://forum.xda-developers.com/desire-816/general/ruu-lollipop-a5dug-firmware-to-fix-wifi-t3126905
to get the wifi fixed, but after that I got boot loop as I can't access the recovery mode as explained with these images:
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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
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That two buttons underneath are (reboot) and (back) but the last image only appears for 4 seconds so I cant do any thing even accessing fastboot!....The phone's still rebooting until this moment since I can't remove the battery..
Please help ...
Solved .. I waited until the battery drain then turn it on again connected to the pc with fastboot and everything is ok now..

Android recovery blue spinning orb??

What does the blue spinning orb in Android recovery mean? This screen showed up immediately after I entered the recovery (not even the interface showed up).
I once encountered something similar when I opened the recovery, and I think it wiped my data without permission. I saw this on my phone again, and I was afraid it was wiping my data without permission, so I pulled the battery.
What does it mean? What "work" is it doing in the background with the progress bar?
P.S. I saw this after I had just flashed a new recovery I think. It is the stock recovery
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"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
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Bump

Samgung J810M touch not working after TWRP

Hi!
i was trying to install TWRP in a Samsung J810M and i found the file in this forum and i downloaded, i used Odin to installed it.
When i entered in recovery mode with TWRP, the touch device stopped working and i can't do anything, i tried using a OTG cable and doesn't work, it's stay like in the image.
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What i can do? i'm really new with rooting android, and doesn't bother me lost the files in the device, but i really don't know how. If i press the button power doesn't happen anything, same with power up + power

Recovery mode shows no options

Hi everyone,
My 7.1 is stuck in boot and I want two perform a wipe, possibly factory reset.
I access recovery mode. When the android appears with "no command" I hold power, click Volume Up, then immediately release Power. Then the screens reads
"supported api: 3
Boot reason: (null)"
I'm stuck there with no other options. The Internet is not helpful and the error appears very rarely on the Internet with scarce information.
I'm not extremely well with boot stuff on android, so I'm seeking your advice :-/
Hope to hear from you soon!
You need to contact "techmesto". They can solve your problem.
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"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
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Not sure if this is the right place but hopefully someone can help.

Hello all, I have the Nord N10 and I tried booting my device into recovery mode, I have not installed anything custom yet no apps what so ever. I get to the boot screen with keyboard and one plus logo. The on screen keyboard is frozen. And everytime I attemp a "hard battery reset" it comes right back to the screen with a frozen keyboard. If anyone knows of any way to fix this that would be wonderful.
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"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
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"lightbox_new_window": "New window",
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:::UPDATE:::: apparently connecting it to my PC and force hard reset on the battery unfroze the key board. All is good thank you anyway.

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