Wrong Restore. Please Help (Very Urgent)
My MAC came with Catalina, when the constant BigSur update notification came, I got bored and installed BigSur. However, I was not satisfied at all. And I wanted to return to Catalina with the restore. I previously backed up with the time machine in Catalina. I booted the Mac with COMMAND + R and selected restore with time machine. When the restore finished I tried to turn on the mac but the problem started here. The apple logo appeared and the mac was closing. Then you learned that downgrading was not like that. I installed Catalina backup on BigSur. Now the mac does not open. I can only connect to COMMAND + R. I tried to restore the bigsur backup again but this time when I turn the mac back on, the automatic COMMAND + R screen pops up. Moreover, without pressing these keys. The version doesn't matter anymore. Catalina or Bigsur accepted. Just let the MAC work. All my work is left unfinished. Please help.
iMac 27″, macOS 11.2