[Samsung Galaxy A3, A5, A7 (2017) Questions & Answe] Anduril97:
A Very Possible and Precise Solution :)

Hey Sir!

Soooooo I've been messing around with this all night and I figured it out somehow after nearly frying my new A5 (2017) lol

I'd recommend that you follow the directions as best you can and as fully to help you not have to redo all your software settings and stuff like I did haha. I think if all this is done in this order you shouldn't have to lose your data. I can't guarantee anything but figured I could share what worked for me. BONUS: I actually don't have an unlocked phone and I'm still locked to my carrier actually! So I don't think all these warnings are necessarily valid. Anyhow, hope it helps. :laugh:

NOTE: I'm not allowed to post website links here for some reason haha so sorry for the inconvenience! All the sites began with the https colon double slash btw! So MAKE SURE to add that to the addresses below (links are in italics)!

FIRST: Completely backup phone using Android Studio as can be found at Tech Republic website /article/how-to-create-a-full-backup-of-your-android-device-without-root/ . Also I'd recommend you do a Smart Switch full backup. Smart Switch will work to some extent and I personally restored from there pretty intact as I didn't have the Android Studio backup option before my phone got wrecked by the Verification error after I attempted to flash SuperSU onto the phone using TWRP.

1. BEFORE ANYTHING ELSE: Enable Developer Mode (by tapping on the Build Number several times), Turn OEM unlock on, enable USB debugging, and make sure all the "factory reset block" is off (or Allow factory reset option is on) and encrypted data features are off, I unlocked any Notes and disabled Secure Folder and Knox and Samsung Pass

2. Turn phone off

3. Boot phone into Custom OS install mode by holding Power+Volume Up+Home

4. I downloaded a TWRP installer file from tx5.androidfilehost.com/dl/TLLV1I5jSqS9Zg68RNh1hA/1538776061/890129502657588962/recovery_a5y17lte-080318.img.tar

5. Download the Odin software to flash TWRP onto your device, I got mine from drive.google.com/file/d/0B-2yp-J_x0LPaGJrSUlUcHE1a2s/view

6. Used Odin 3.1 to flash TWRP onto Recovery using the AP function, also turned Auto Reboot and F.Restart off (unchecked boxes)

7. Downloaded (newest file that's a zip) such as no-verity-opt-encrypt-6.0.zip from build.nethunter.com/android-tools/no-verity-opt-encrypt/ and put it on the SD card in the phone

8. Turned phone off and booted it into Recovery Mode by holding Power+Volume Down+Home

9. Used TWRP recovery to flash the no-verity-opt-encrypt-6.0.zip which sort of disables all the security things on Samsung (such as Health and Pass and Auto Updates) that would block your work, and this actually lets you reboot your phone instead of getting the Verification Integrity Check failed error and having to reset your phone every time.

10. After rebooting my phone, everything was running fine. I then downloaded SuperSU file SR5-SuperSU-v2.82-SR5-20171001224502.zip from download.chainfire.eu/1220/SuperSU/SR5-SuperSU-v2.82-SR5-20171001224502.zip?retrieve_file=1

11. Used TWRP in Recovery Mode to flash SuperSU onto phone from SD card and hit Reboot. Slight boot loop was visible and then the phone restarted normally with SuperSU installed and full root access. Thanks be to God.

Again, I can't guarantee this will work BUT it is the first walkthrough that I know of on the web. Hope it helps at all!