How to install METAL SLUG ATTACK v6.21.2 MOD APK (Unlimited AP/Skill)

Remember where the METAL SLUG ATTACK v6.21.2 MOD APK (Unlimited AP/Skill) APK file was saved. Click on it to install. Initially, you may experience an installation failure.
Since android does not allow to install APK from Unknown Sources, please do the following:
-> Open the downloaded METAL SLUG ATTACK v6.21.2 MOD APK (Unlimited AP/Skill) .apk file. You will see a warning message as shown:
Install
-> Click Settings (Settings).
-> Click the Turn button (Turn on).
-> Go back and reopen the downloaded APK file. Click the Install button (Install).

How about setting OBB or Data file?

Extract downloaded OBB or Data file in PC or laptop
+ Copy the folder 'DATA' and put it in the given path:
SD Card> Android> Data> ** paste the folder here **
+ If it's an OBB file, copy the OBB folder to: SD Card> Android> OBB> ** paste the folder here **+ If there is no OBB or Data folder, create it manually.
+ Make sure the files are copied successfully in your SD card.
+ Disconnect your phone from the PC.
+ Run the APK file now.

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