Samsung J3 or J330f , how to downgrade from Android 9 pie to android 7 ? - Android Q&A, Help & Troubleshooting

Hello my question is how to downgrade my samsung j330f from android 9 pie to 7 nougat ?
I try all firmwares with odin but bootloader on my phone sad device 4, binary 3 . How to solve that .
how to do this downgrade ? Can anybody help me ? must be some way...
On odin sad FAIL
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did you ever figure out how to?

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Step 1: Enable USB Debugging
The first thing you need to do is turn on Developer Options on your phone by going to Settings, finding the About phone section, and then tapping the Build number until you get a message that says You are now a developer!.
Next, go into Developer Options and enable USB debugging and OEM unlocking.
Step 2: Connect Your Phone to Your Computer
Connect your phone to your PC with a USB cable.
On your PC, navigate to the location where the SDK Platform Tools folder is saved and put the Android factory image you downloaded there. Factory images usually come in ZIP files that contain IMG files; unzip the factory image right there in the Platform Tools folder.
Now, while still in the Platform Tools folder, hold Shift and right-click inside the window, and then select Open PowerShell window here.
In the PowerShell window that opens, type adb devices to check if your phone is being detected. If it is, you should see its serial number listed. If not, try using a different USB cable.
Step 3: Unlock the Bootloader
Once your device is in fastboot mode, now it's time to unlock your phone's bootloader. This is a crucial step as without unlocking the bootloader, you can't install the previous version of Android on your phone.
Depending on your device, type fastboot oem unlock, and if this doesn't work, type fastboot flashing unlock instead. If everything goes well, you should see a confirmation on your device that the bootloader is now unlocked. This step will also wipe your device.
Step 4: Install the Older Version of Android
Some manufacturers will include a "flash-all" script as part of the downloaded factory image that will automatically flash everything for you. If this is the case, the script should be in the SDK Platform Tools folder along with the IMG files you extracted.
Now, double-click on the flash-all.bat script. A box should pop up showing you the flashing process as it happens. Please do not unplug your phone during this process!
Your phone should now restart. If everything went well, you should now be running a downgraded version of Android. You'll need to set your phone up again from scratch.
Greetings,
J Wick