How do I start my phone after a run ADB Terminal mke2fs -T?

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AC Question

How to start my phone after run ADB Terminal mke2fs -T

i run mke2fs -T ext4 /dev/block/mmcblk0p8 command in TWRP Terminal on root directory. Now my phone not starting.
When i connect using USB cable in PC it display many drives. please help me