[LineageOS Questions & Answers] moriahrhys7200:
Note: I found a solution, I added an Edit at the end

Hellos guys, i'm new here, so I don't know if this is the right section to post this, especially since my situation is a bit ridiculous, but I have no choice:

First of all, sorry for my English, it's not native language.

So, I have a Samsung Galaxy A3 2016, and following incorrect handling (while trying to install LineageOS) it no longer works:

The OS is deleted (this was originally done on purpose, more details below)

Recovery mode no longer works (deleted during the installation of TWRP, then TWRP no longer works, details below)

When connecting the phone to a computer via USB cable, the battery charges, but the computer (Windows or Linux) does not detect it.

Download mode works, but is useless since the computer does not detect the phone if you connect it via USB.

When you turn on the phone, it stays frozen on the image with the logo for a few minutes then turns off.

I'm looking for a solution. There must be one since when the phone is manufactured, there is nothing on it, so the OS doesn't magically appear on it?

I imagine the solution would be to find a way to reinstall TWRP or equivalent via the SD card, to reinstall a rom.

But how do I actually start the startup? Maybe a script (on the sd card) that starts automatically when turned on?

I even discussed the situation with different AIs, having them play the role of a Samsung engineer, but to no avail.

I hope someone has an idea, or at least a clue to give me to guide my research. Everything I find online is aimed at people who still have access to (at least) receovery mode.

In case it helps, here's how I got to this situation:

1: In order to install LineageOS, I installed TWRP with odin on windows. But it didn't go as planned:

When I tried to install the latest version of TWRP for my device, it didn't work, but the original recovery mode had been erased.

2: Instead of testing all versions of TWRP offered for my device, I did a Google search, and found a website with an old version (3.0.0-0) that was supposed to work on my model so I installed it.

This time TWRP works, and I manage to unlock the booloader. On the other hand, it was after that that it got complicated:

3: The LineageOS installation images compatible with my phone are a3xlte and my version of TWRP did not support them.

And the original OS was already deleted, so no OS installed on the device.

4: This is where I tried to install the latest version of TWRP on the phone from my SD card, via the (old) version of TWRP installed on my device.

From what was on the screen, the installation worked. But when I rebooted, it was impossible to access TWRP or recevery mode.

Thanks for reading. I hope someone has an idea.

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[Edit]:

Thank you for your answers. I didn't expect to get feedback so quickly. I ended up finding the "solution":

After having reinstalled all the tools like ADB and Samsung drivers (for different languages like US English, as well as the language of my computer), then restarted the computer, tried several USB cables, several USB inputs from the computer, Odin ended up detecting the phone when I contacted him:

In fact, it seems that there is a bug with Odin with my configuration (Windows 10 + Asus laptop + samsung A3 2016). To resolve the problem, simply change the port and/or USB cable several times until it detects the phone.

From there, I was able to reinstall the original rom (my life was smooth LOL), then install version 3.6 of TWRP (which is not the most recent, but which worked) which allowed me to install lineageos 20.

My old Samsung from 2016 looks like new.

Thank you all for your care