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 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 top online slot machines 6375 User must reboot the device to 'Home Screen' and make sure OS is upgraded successfully to perform another OS update from recovery mode You may need to

top online slot machines Flashing AB zip to inactive slot: B Step 12 Step 22 To flash additional zips, please reboot recovery to switch to the updated slot

totem wonders pg slot 6375 User must reboot the device to 'Home Screen' and make sure OS is upgraded successfully to perform another OS update from recovery mode You may need to I am trying to use for upgrading android images in eMMC Nand flash Please suggest if it is feasible to