This Firmware flash for Samsung Galaxy J4+ with the Model Number is SM-J415N. Firmware Region is South Korea and CSC code is KOO . Make sure the Model Number are correct with you device. You can check the Model Number in Setting - About phone (Model Number), If phone can't start you can find it by flipping your phone or among the things you found in the box. This Firmware PDA is J415NKOU2CUD2 with OS Q(Android 10) and the Firmware are build on Mon 10 May 2021 10:58:09 am.

Download Firmware Samsung Galaxy J4+ (SM-J415N)

AP Version: J415NKOU2CUD2
CSC Version: J415NKOO2CUD2
Android Version: Q(Android 10)
Region: KOO
Country: South Korea
Binary: 2

Build Date: 2021-05-10 10:58:09
Size: 2.4 GB
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About Phone:

Samsung Galaxy J4+ Android smartphone. Announced Sep 2018. Features 6.0″ IPS LCD display, Snapdragon 425 chipset, 3300 mAh battery, 32 GB storage, 3 GB RAM.

Admin May 10, 2021 SM-J415N, KOO

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How to flash firmware

Extract (unzip) the SM-J415N_KOO_J415NKOU2CUD2......J415NKOU2CUD2.zip file. using WinRAR or 7-Zip.
Download Odin Tool 3.14.1
Extract Odin and open it.
Reboot Samsung Phone in Download Mode (hold Home + Power + Volume Down buttons / hold Volume Down + Bixby buttons then plug-in cable)
Connect you Samsung Phone and wait until you get a BLUE sign in Odin.
Add the 1 file Samsung firmware to AP/PDA or 4 files Samsung firmware (AP/BL/CP/CSC) to it's slots.
Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
Click the start button, wait for Odin to say 'PASS' in a GREEN sign. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.

The Samsung Galaxy J series is a discontinued line of entry-level Android mobile devices produced by the South Korean company Samsung Electronics, first introduced in 2015. This series is a part of Samsung Galaxy series, placed below the low-range Galaxy M.

Source: wikipedia.org