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
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tonites lottery numbers I installed manager directly on android stick and patched the stock recovery image Then i rebooted into recovery by only pressing the Reset

to to lottery slot: B Devices on super may not mount until rebooting recovery To flash additional zip please reboot recovery to switch to the update slot  And if it is going , then simply flash the stock rom zip file through custom recovery by wiping cache etc