I'm not familar with this but I link a few helpsites. I hope you can translate them with your browser.
You should install fastboot and adb first on Zorin (IT's foss link describes it).
You need it to unlock bootloader.
Enable developers options. Then in developers options enable oem unlock and usb debugging.
(1) This is the Zorin OS support forum, as such, we are not responsible for IodeOS. You need to go to there support forum, to get assistance.
(2) Additionally, don't expect us to provide info on how to unlock the bootloader on your device. Unlocking a boot loader, leads to violating mobile device warranties. You do so at your own risk, and Zorin Group are not responsible for damages by doing so.
(3) Best advice is to contact IodeOS support forum.