SM-T295 - Finally rooted tablet!! (updated 19-March-2021)

J.Michael · Feb 24, 2023

ebod said:
This occurred:-/

VVVVVVV

ebod said:
Here's the result, only syntax is the initial hello didn't have a capital H...would that matter?
View attachment 5845309

ebod said:
STOP THE PRESS!! I've got there (auto-start that on usb power that is ).
I jumped onto this thread @Post #212 and got schooled to a successful outcome.

[Q] Power on when plugged in (boot when docked)?

Appologies if this has been asked/answered here before. I tried searching, but didn't find any solution. Maybe someone else has stronger Google skills than I. Here is what I am trying to do. I'd like to find a way to have the Galaxy Tab power on...

forum.xda-developers.com

So left on the list is trying to replace Samsung boot animations with VOLVO ones...and that damned annoying bootloader unlock warning...gawd I'm sick of seeing that!

In reverse order:

Congratulations. How you can navigate the process of unpacking/modifying/repacking a boot image, reassembling the initial ramdisk on the way, but you can't make a text file is beyond me.

The command to list files is "LS -L", except all lower case.
The point of the exercise was to demonstrate a way to create a text file. A second "echo" command, this time with a double greater-than (">>") would result in appending the second line to the existing file.
Since you've downloaded Notepad++ to your Windows machine, you are probably past caring.

I have no idea what to do with "VVVVVVVVV" (I didn't count).

Minionguyjpro · Feb 24, 2023

ebod said:
STOP THE PRESS!! I've got there (auto-start that on usb power that is ).
I jumped onto this thread @Post #212 and got schooled to a successful outcome.

[Q] Power on when plugged in (boot when docked)?

Appologies if this has been asked/answered here before. I tried searching, but didn't find any solution. Maybe someone else has stronger Google skills than I. Here is what I am trying to do. I'd like to find a way to have the Galaxy Tab power on...

forum.xda-developers.com

So left on the list is trying to replace Samsung boot animations with VOLVO ones...and that damned annoying bootloader unlock warning...gawd I'm sick of seeing that!

You can also speed up loading by adding a few lines to the build.prop file in /system. I've made a post about it like 1, 2 or 3 pages ago.

ebod · Feb 24, 2023

Minionguyjpro said:
You can also speed up loading by adding a few lines to the build.prop file in /system. I've made a post about it like 1, 2 or 3 pages ago.

yep something worth coming back to. Right now although I have an auto-boot, it boots twice, i.e. once and the battery animation flicks on...then a second later it boots again onwards into system. The next target is to kill boot loader unlock warning as it adds to the time during this double boot.
So cracking the process of getting this 'param' file is key

Talich52 · Feb 24, 2023

ebod said:
The next target is to kill boot loader unlock warning as it adds to the time during this double boot.
So cracking the process of getting this 'param' file is key

I decided to measure the boot time from the off state. Total 1 minute 20 seconds. The unlocked bootloader splash screen for the first 10 seconds, then the Samsung Galaxy Tab A splash screen for 40 seconds. If the unlock splash screen is removed, the total time will decrease by 10 seconds to 1 minute 10 seconds ...

Minionguyjpro · Feb 24, 2023

Talich52 said:
I decided to measure the boot time from the off state. Total 1 minute 20 seconds. The unlocked bootloader splash screen for the first 10 seconds, then the Samsung Galaxy Tab A splash screen for 40 seconds. If the unlock splash screen is removed, the total time will decrease by 10 seconds to 1 minute 10 seconds ...

Using LineageOS 20, with the tweaked build.prop, and still having a unlock warning it'll boot in 20-30 seconds

!

Minionguyjpro · Feb 24, 2023

Minionguyjpro said:
Using LineageOS 20, with the tweaked build.prop, and still having a unlock warning it'll boot in 20-30 seconds !

Keeping it though, it works very nice. It has some exclusive features than from stock, also having a newer Android version. If LineageOS 21 releases for Android 14, I'll ask the developer from the official version to LineageOS 21, if it isn't yet from then. I saw that the version of LineageOS was first 19.1, as I saw a branch with it on the GitHub and also a LineageOS 20 branch.

ebod · Feb 26, 2023

Talich52 said:
Animation files when loaded at /system/media. 2 files - bootsamsung.qmg & bootsamsungloop.qmg. Can be replaced via TWRP.

I've been exploring this logo action today and using the downloaded Samsung Theme creator tool I've managed to create what I 'hope' will be a Volvo looping image. Its set at 1280x800 and aimed to run in landscape on a car dash.
I've followed this old guide but its pics have long gone

[How To] Create your own QMG boot animations [must be rooted]

Reproduced with kind permission by xessus Hi everyone, this is my guide to create extension .QMG files used by Samsung to storage images & animations like bootanimation and shutdown animation. ok lets kick it! Software required: Samsung theme...

forum.xda-developers.com

My final question just before I drop the modded bootsamsungloop.qmg into system/media ( I have made a backup! ) is about file permissions. What should they be using Root Explorer ?

A YT vid mentions '644' ?

Talich52 · Feb 26, 2023

ebod said:
My final question just before I drop the modded bootsamsungloop.qmg into system/media ( I have made a backup! ) is about file permissions. What should they be using Root Explorer ?

My RootExplorer shows a different picture and a resolution of 0644.
And the general rule is that the new file must have the same permission as the old one.

ebod · Feb 26, 2023

Talich52 said:
My RootExplorer shows a different picture and a resolution of 0644.
And the general rule is that the new file must have the same permission as the old one.

yey it did work without bricking the device ( rw-r-r- 0644 ). Only issue is its a squashed animation as I got the 1280x800 wrong, primarily I think it needed to be 800x1280 with the logo indexed round 90degrees to suit landscape viewing
But the method is proven, I just need to try again and once the animation loop file is correct...then do similar for the static boot/shutdown images.

Minionguyjpro · Mar 27, 2023

ebod said:
yey it did work without bricking the device ( rw-r-r- 0644 ). Only issue is its a squashed animation as I got the 1280x800 wrong, primarily I think it needed to be 800x1280 with the logo indexed round 90degrees to suit landscape viewing
But the method is proven, I just need to try again and once the animation loop file is correct...then do similar for the static boot/shutdown images.

And? Did you still do some stuff?

doniedogawa · Apr 6, 2023

Hello, i just bought used T295 XID (indonesian version) with android 11 WC1 firmware and it's already bootloader unlocked. Can I install magisk without TWRP with this method?

Minionguyjpro · Apr 6, 2023

doniedogawa said:
Hello, i just bought used T295 XID (indonesian version) with android 11 WC1 firmware and it's already bootloader unlocked. Can I install magisk without TWRP with this method?

Sadly, no, not anymore. Your bootloader version must be 3, which is 4. Version 4 does not allow ANY custom stuff anymore. The bootloader cannot be downgraded, for now.

doniedogawa · Apr 7, 2023

Minionguyjpro said:
Sadly, no, not anymore. Your bootloader version must be 3, which is 4. Version 4 does not allow ANY custom stuff anymore. The bootloader cannot be downgraded, for now.

So, I can't flash the OS back to 9 or 10?

J.Michael · Apr 7, 2023

doniedogawa said:
So, I can't flash the OS back to 9 or 10?

You can probably flash the OS back to 9 or 10. What you cannot do is reduce the version number of the bootloader.

I do not know whether flashing the version 3 bootloader (BL.tar file) results in successfully flashing and then having the tablet refuse to boot; or if the flashing phase results in failing to flash.

I am pretty sure people in this thread describe mixing and matching .tar files, i.e., they run Odin and specify an AP.tar from one release and a BL.tar from another -- that's how some people update Android to 10 without updating the bootloader past v3.

Minionguyjpro · Apr 7, 2023

doniedogawa said:
So, I can't flash the OS back to 9 or 10?

J.Michael said:
You can probably flash the OS back to 9 or 10. What you cannot do is reduce the version number of the bootloader.

I do not know whether flashing the version 3 bootloader (BL.tar file) results in successfully flashing and then having the tablet refuse to boot; or if the flashing phase results in failing to flash.

I am pretty sure people in this thread describe mixing and matching .tar files, i.e., they run Odin and specify an AP.tar from one release and a BL.tar from another -- that's how some people update Android to 10 without updating the bootloader past v3.

It might indeed be possible to lower the OS. I thought when you try to flash a lower bootloader, it just fails to flash it.

Talich52 · Apr 16, 2023

doniedogawa said:
Hello, i just bought used T295 XID (indonesian version) with android 11 WC1 firmware and it's already bootloader unlocked. Can I install magisk without TWRP with this method?