Unbrick GS5A after following 4.4.4 root guide?

hey guys! I followed the guide here

Quote:

**Make certain that your reactivation lock in security settings is off before beginning this process** 1. Take the NG3 OTA update. 2. Download and install Towelroot-v3.apk(this version does not require internet access). 3. Place your phone into "Download Mode" (press and hold the Home, Volume Down, and Power keys until the phone powers on and displays warning screen, then press Volume Up key) and flash the G870A_NE4_Stock_Kernel using Odin's PDA slot(AP in Odin v3.09+). 4. Open the Towelroot app from your app drawer and press "Make it Rain" to root your device. 5. Power off then boot into "Download Mode" again and flash the G870A_NG3_Stock_Kernel also in Odin's PDA slot(AP in Odin v3.09+). 6. Download SuperSu to manage root access. Done! Troubleshooting: 1. If the NG3 OTA update fails consider flashing the G870AUCU1ANE4_Full_Odin.tar to return to stock then take the NG3 OTA update, (or place the G870A_NE4toNG3_OTA.zip onto your ext-sdcard and sideload from stock recovery). Once updated to NG3 continue to Step 2 above. 2. The most common cause of an Odin flash failure is a bad usb port or cable. Please check before reporting a failure. Notes: 1. After flashing the NE4 kernel your phone may run a little wonky and towelroot may not root on the first try. If that happens reboot and try towelroot once again. Once rooted and after flashing the NG3 kernel your phone will once again run like a champ! 2. The above process will not affect your User Data or Knox Warranty Flag. Credits: @lordmorphous - Tester

... while I was on the latest OTA.

Am I totally screwed, or is there a magical fix that I could do? Thanks in advance!

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