Galaxy S3 LTE i9305 Soft-/Hardbrick - Android Q&A, Help & Troubleshooting

Hey,
I'm using a Samsung Galaxy S3 LTE (i9305) at the moment, on which I tried to install TWRP and CM13.
At first the installation of TWRP did not work - after that, the SIM card didn't work as the cellphone made a restart into the system.
After a little bit of research (and a few videos on YouTube) I managed to install TWRP and installed CM 1 3 (unofficial) on my phone.
After a restart my phone was stuck in bootloop - the CM logo was only shown at the start and did move.
I made a factory reset after that and tried to install TWRP again, this time with CM 11 (official) - with the same problems as before.
After I installed CM 11, Windows shortly recognized the phone when it booted - but I don't know, if my PC would have recognized the others too (Windows just played the sound it does, when a new device is connected)
The TWRP version is 3.0.2-1.
Any idea what I could try now?
Thanks in advance!

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