You can easily omit the FRP Galaxy A8 Plus and the Samsung Galaxy A8 Android 7.1.1 device, just download the correct "ROM + Stock Combined ROM", you can download these files from below, then to open the software "Odin" and then update with firmware, each step is described below, just follow all steps carefully for Skip the FRP Galaxy A8 Plus / A8. This method is only for "DEVICE OWNER".
Note: This method was applied successfully in Galaxy A8 + (SM-A730F), Android 7.1.1.
Download the Galaxy A8 + / A8 firmware on your Computer:
You must download only the relevant file from your device below, if you have galaxy A8 +, then download "ROM STOCK + ROM COMBINATION" from A8 + in your computer.
⇒ (STOCK ROM A8 +) SM -A730F_A730FXXU2ARD3 [DOWNLOAD]
⇒ (Combination ROM A8 +) FA71_A730FXXU1ARA1_OXM_CL12745816_QB16373540 [DOWNLOAD]
⇒ (ROM STOCK A8) SM-A530F_A530FXXU2ARD3 [DOWNLOAD]
⇒ (Combination ROM A8) FA71_A530FXXU2ARC4_OXM_CL13196886_QB17551889 [DOWNLOAD]
Download FRP Bypass Tool on your computer:
You must download the frp tools on your computer below.
⇒ Odin Software 3.12.7
⇒ ADB FRP 
⇒ Samsung USB Driver
Let's start by circumventing FRP Galaxy A8 Plus / A8:
-Install "Samsung USB Driver" on your computer.
-Auturn "Antivirus Software", otherwise you can not use the "ADB FRP BYPASS" application.
-Extracted downloaded firmware both "Stock ROM + ROM combined".
– Open "Odin Software."
– Click on " AP " and then provide the file path of "Combination ROM".
Note: Be sure to have .tar extension in your file path. (See image below)
Connect Samsung Galaxy A8 + / A8 to the computer:
– Turn off the Galaxy A8 + device.
-Press and hold the keys (Volume UP + Lap down + On) until " Warning! " appears on your device.
– After that, press (Volume Down)) Keys to continue.
-Now you have successfully entered "MODO DESCARG."
-Take a micro USB cable, and then connect your device to the computer.
Flash Galaxy A8 + / A8 By ROM combination:
-Go to "Odin Software".
– You will see that "ID COM" has changed to "Blue color" because your device has been detected by Odin.
Note: If the computer does not detect your device, reinstall "Samsung USB Driver" and reconnect it to the computer to make sure your device is being detected. cited by computer, you can also check your device in "Device Manager" of the computer.
-Click "Start button" to flash with the combination ROM.
-Once you see a sign for " PASS! ", disconnect your device.
-Let the device be automatically entered into "Factory Binary".
-Touch on the "Menu" icon from the upper left corner.
-Go to "Settings."
-Go to the "Developer Option".
– Execute the option "USB Debugging" from there.
Enable ADB mode by code:
-Return to the home screen.
– Background of the screen, there is option "IME", simply click on that to open "Calculator".
-Type of code there " * # * # 0808 # * # *  "
-From the USB configuration, select" AP ", after that, also select" DM + ACM + ADB ".
-Tap on "Restart". (See the image below)
-With successful Bypass FRP Galaxy A8 Plus / A8, we have to use "ADB FRP BYPASS" Tool
Allows the FRP Galaxy A8 Plus By ADB FRP Bypass:
-Automathe antivirus software.
-Extract the "ADB FRP" tool from the winrar file.
-Go to extracted folder, and then double-click on "ADB-FRP".
– connect your Galaxy A8 + device to the computer.