Unlock Realme GT neo 2 bootloader
Miguel GFirst download all required files:
The tool:
https://devuploads.com/m7r7n78n718h
Drivers:
https://devuploads.com/79aljsm5gdk1
(I also installed these ones)
https://github.com/koush/adb.clockworkmod.com/releases/latest/download/UniversalAdbDriverSetup.msi
platform-tools
(I prefered to download them directly from Google):
https://dl.google.com/android/repository/platform-tools-latest-windows.zip?hl=es-419
Your downloads folder should look like this:

Unzip everything.
Now install the Qualcomm Driver.
all-drivers\USB Drivers\Qualcomm_USB_Driver_v1.0\Qualcomm_USB_Driver_v1.0

Make sure to tick the second option when prompted:

Next driver. Open device manager and right click over your computer name > Add drivers

Then browse to this folder:
Downloads\all-drivers\usb_driver_r13-windows\usb_driver
Click next and the driver should be added successfully:

Finally install UniversalAdbDriverSetup.msi as any usual program. Next, next finish.
Now all that is done we will copy RMX3370-UBL and platform-tools-latest-windows to C:\

Ok, now lets check that our computer see the phone:
Navigate to C:\platform-tools-latest-windows\platform-tools
Once there type cmd on the navigation bar and press enter

At this moment we connect our phone to the computer for the first time
Make sure to select "File Transfer / Android auto" on the phone.
As well make to sure to have enabled USB Debugging on Developer options.
On the computer type: adb devices,
You may be prompted on the phone to allow the connection.
The phone should be listed:

Ok, all the preparatory steps are done.
Navigate to C:\RMX3370-UBL
Execute: CLICK-THIS TOOL.exe
Click on the button next to the drop-down menu that says "common".

You may get this error:

This is not the expected behavior
This is because of language and regional format settings. change them to English. These worked for me:

The expected behaviour is to get a file selection window.
Select prog_firehose_ddr4_fwupdate.elf
A cmd window will appear and will prepare the computer to connect the phone.
Now we must connect the phone in EDL mode.
While holding the buttons volume up and volume down connect the USB cable.
NOTE: We can set it in EDL mode as well using adb: adb reboot edl
It should appear in device manager like this: "Qualcomm HS-USB-QDLoader 9008"
(it is recommended to keep device manager open through the whole process so we can monitor if it correctly connected or not)

Now, let that window open in the background, and bring to foreground the tool.
Click here:

A new cmd window gets opened. We will work here now.
We will type: ocdt
We press Enter
A file selection window appears.
We select B70-ocdt.img

If everything goes well we should get this output:

Now we type: abl
We press Enter
A file selection window appears.
We select 3370_abl.elf
If everything goes well we get this output:

Now we click the button that says FastbootD

The phone will vibrate and it will go to fastboot mode. While in this mode the screen is off.
To check that the phone is available it should appear in device manager but is faster to execute on our cmd opened in C:\platform-tools-latest-windows\platform-tools
fastboot devices
it should be listed

Now we type:
fastboot reboot bootloader

Now we type:
fastboot flashing unlock

Then, on the phone, press volume down twice, then power button.
It's should be unlocked. We are going to check it.
Back on the computer type:
fastboot devices
It should be listed as usual.
Then type:
fastboot getvar unlocked

Congratulations! Your device is unlocked! but we need to get the bootloader working back properly, so we need to do the following:
Close all the windows related to the chinese tool.
Reopen the tool
Click on the tool here:

Select again prog_firehose_ddr4_fwupdate.elf
A cmd window will appear and will prepare the computer to connect the phone.
We are going to reconnect our phone in EDL mode. DON'T UNPLUG USB CABLE.
Just type fastboot reboot in our platform-tools cmd and at the moment of pressing enter. make sure to inmediately hold the buttons, volume down and volume up on the phone.

Now, let that window open in the background, and bring to foreground the tool.
Click here:

A new cmd window gets opened. We will work here now.
We will type: ocdt
We press Enter
A file selection window appears.
But this time we select stock-ocdt.img

It does its thing and we should get this output:

We can close that window.
Now click on "Recovery"

Unplug cable you should see that the screen comes back to life with the realme white logo.
It should go to recovery (it may bootloop 2 o 3 times, don't panic)
In case it doesn't go to recovery after waiting, hold power button and volume up.
Select language
Then format.
Truly congratulations! We are done.
IMPORTANT:
Remember you can't use fastboot mode before you install any custom recovery
EXTRA:
FLASH RECOVERY
To flash a recovery we can do it the same way we did it with ocdt.
First download recovery .img file.
OrangeFox is recommended, donwload the latest release available.
https://github.com/RAM-UNLOK/android_device_realme_bitra-ofox/releases
Rename it to recovery.img
Open the tool, click on the button to connect in EDL mode, select prog_firehose_ddr4_fwupdate.elf

And click the button to flash stuff:

Type: recovery
Press Enter
select recovery.img
Press Recovery button on the tool
Now we can use fastboot mode.
Special Thanks to @Ts_queen1 on t.me/RealmeGTNeo2_Official
I don't make responsible in any manner to damages you may cause to your device.
It's your responsability if you decide to follow this guide.