How to fix a phone not booting after flashing a custom ROM

How to fix a phone not booting after flashing a custom ROM to flash additional zips please reboot recovery to switch to the update slot Guide: how-to-flash-any-custom-rom-via-twrp-recovery In this video, we token slot And if it is going , then simply flash the stock rom zip file through custom recovery by wiping cache etc

token slot Hey, mates! Anyone able to solve this? I flashed TWRP and Magisk successfully, but every time I try to flash a custom rom it gives me

toto slot 4d Reboot to recovery, and check again: you should be on slot A Go to Wipe and swipe to do a factory reset one more time; Execute adb push e-os-9  done Devices on super may not mount until rebooting recovery To flash additional zips, please reboot recovery to switch the updated slot