Once you have the correct magisk_patched_9.0.7.img , use one of these methods.
A patched boot image is the device’s stock boot partition image modified to allow systemless root via Magisk. Magisk injects its boot patch so root, modules, and certain systemless changes work while keeping SafetyNet and other protections intact where possible. download 9.0.7 patched boot image for magisk
shasum -a 256 magisk_patched_9.0.7.img
Connect your phone to the PC and run: adb reboot bootloader Once you have the correct magisk_patched_9