I'm losing my mind. This is the last place to ask.
Basically what I did is described in this thread
Moded system UI files by swift installer prevented the OTA update from Oreo to Pie. Now I'm stuck in boot loop after flashing stock oreo. I flashed home_csc because I want all my apps and data. So my question is ... how to backup apps and all their data when all I can enter is download mode? I have found these solutions ADB and HOLO backup But I'm not sure if it's possible on SGS9 Do you have any ideas or advice?