For those of you who can't access Safe Mode and your Mac keeps rebooting into Recovery Mode, try clearing PRAM by pressing the power button and then press command-option-p-r. This should lead you to the login screen instead of Recovery Mode 🙏 Only this helped me to take control of the computer. Then needed to erase previous system volume (it was unrecoverably damaged) and install Catalina. No more interest for playing with any beta versions.
spryght
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iMac 2017. Tried to reinstall the OS by internet (macOS High Sierra was suggested!) but the system goes always to the recovery page, safe mode does not work anymore. Never had any Symantec software on the computer.
Same with iMac 21.5” 2017 4K Retina + external SSD. Could only start in safe mode. Otherwise the computer is dead.