Stuck in flashing samsung logo bootloop after factory reset. SM-G925 on a Macbook - Galaxy S6 Edge Q&A, Help & Troubleshooting

Hi there, I hope you guys can help me. Here is the information I have, and thank you so much in advance for your help. Really hope someone will be able to help my stupid self. Haha.
SM-G925F
1.Your bootloader status if applicable - UNLOCKED
2. Rom name with complete baseband/date/version - NEMESIS NOUGAT STABLE S7E PORT V3.1 -
3. Kernel name - Linux 3.10.x
4. Any Mods you are using - None
5.If you are using Custom Rom, your flashing style i.e dirty/clean or you wiped anything else in specific - Flashed Nemesis after flashing another rom that used superSU, then attempted to restore superSU while still using the same rom. I believe this caused a bootloop and I factory wiped the phone to attempt to resolve the bootloop, which has been unsuccessful.
6. If you used any guide, link to the guide - N/A
7. Root status - ROOTED
8. Your exact problem - When attempting to power up the device, stuck in the flashing samsung logo screen. I am able to access both TWRP recovery screen and download screen, however TWRP does not recognise .tar.md5 files, so it seems I am unable to flash a recovery.
9. Any method you tried that failed - Factory wiping the device
10.Any other detail you think would be necessary - I believe am unable to use ODIN as I am using a Macbook, however I am attempting to use it via Parellel. I can still transfer zips to the sd card using the TWRP recovery. The download screen reads:
ODIN MODE
PRODUCT NAME: SM-G925
CURRENT BINARY: CUSTOM
SYSTEM STATUS: CUSTOM
REACTIVATION LOCK: OFF
SECURE DOWNLOAD: ENABLED
KNOX WARRANTY VOID: 1 (0x030c)
RP SWREV: B:5 K:2 S:2

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alexsamsungsht said:
Hi there, I hope you guys can help me. Here is the information I have, and thank you so much in advance for your help. Really hope someone will be able to help my stupid self. Haha.
SM-G925F
1.Your bootloader status if applicable - UNLOCKED
2. Rom name with complete baseband/date/version - NEMESIS NOUGAT STABLE S7E PORT V3.1 -
3. Kernel name - Linux 3.10.x
4. Any Mods you are using - None
5.If you are using Custom Rom, your flashing style i.e dirty/clean or you wiped anything else in specific - Flashed Nemesis after flashing another rom that used superSU, then attempted to restore superSU while still using the same rom. I believe this caused a bootloop and I factory wiped the phone to attempt to resolve the bootloop, which has been unsuccessful.
6. If you used any guide, link to the guide - N/A
7. Root status - ROOTED
8. Your exact problem - When attempting to power up the device, stuck in the flashing samsung logo screen. I am able to access both TWRP recovery screen and download screen, however TWRP does not recognise .tar.md5 files, so it seems I am unable to flash a recovery.
9. Any method you tried that failed - Factory wiping the device
10.Any other detail you think would be necessary - I believe am unable to use ODIN as I am using a Macbook, however I am attempting to use it via Parellel. I can still transfer zips to the sd card using the TWRP recovery. The download screen reads:
ODIN MODE
PRODUCT NAME: SM-G925
CURRENT BINARY: CUSTOM
SYSTEM STATUS: CUSTOM
REACTIVATION LOCK: OFF
SECURE DOWNLOAD: ENABLED
KNOX WARRANTY VOID: 1 (0x030c)
RP SWREV: B:5 K:2 S:2
Click to expand...
Click to collapse
First thing... if it's just stuck on the glowing Samsung logo then it's not a bootloop. It can take a while to boot so leave it about 20 minutes.
TWRP won't recognise tar.md5 files as it doesn't flash them. It flashes .zips. Odin is the one to flash tar.md5.
TWRP is the recovery, so you can't flash a recovery through a recovery (twrp)
What I would try from here... power on the phone and leave it on the Samsung logo for a while and it should boot. If it doesn't then just reflash nemesis ROM through twrp and start again.