Did I accidentally delete the phone's data when activating Download mode using Odin?

A friend of mine asked me for some help with bringing back some lost data from his phone where there was an essential piece of information in it (his little son unwaveringly deleted it). It's been years since I tried that sort of thing, but I gave it a go. I just read some people had varying degrees of success with third-party apps essentially using **MOBILedit**. I knew that, for it to have extended access to the phone's (Samsung Galaxy Z Fold4) memory, I had to set up root access for the phone. So I went to download the relevant firmware data (SMF 936B Turkey 2024-10-16 F936BXXS8GXIC, he bought the phone while on vacation in Turkey) and **Odin**. And before that, I had downloaded **Magisk**. But when I activated download mode and set **Odin** to work, it just ended with failed. And after that, whatever effort I put in to get out of download mode, it didn't work. Now I'm stuck in download mode. I need answers to two questions: 1. Does this mean I may have completely erased data from memory? 2. What should I do to fix this situation and get out of download mode?