[Android Q&A, Help & Troubleshooting] PepsiRrely:
Actually, fastboot mode is working, but the bootloader is still locked. I can't unlock it, because the data I want to recover would be destroyed. I attached the variable info.

Any idea on the cause of getting stuck in the "powered by android" screen?

(bootloader)	max-download-size: 0x8000000
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:flashinfo: 1000000
(bootloader)	partition-type:flashinfo: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:userdata: 10577c000
(bootloader)	partition-type:userdata: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:cache: 19000000
(bootloader)	partition-type:cache: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:system: 98800000
(bootloader)	partition-type:system: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:metadata: 2500000
(bootloader)	partition-type:metadata: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:nvdata: 2000000
(bootloader)	partition-type:nvdata: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:frp: 100000
(bootloader)	partition-type:frp: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:tee2: 500000
(bootloader)	partition-type:tee2: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:tee1: 500000
(bootloader)	partition-type:tee1: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:keystore: 800000
(bootloader)	partition-type:keystore: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:secro: 600000
(bootloader)	partition-type:secro: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:oemkeystore: 200000
(bootloader)	partition-type:oemkeystore: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:seccfg: 80000
(bootloader)	partition-type:seccfg: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:expdb: a00000
(bootloader)	partition-type:expdb: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:logo: 800000
(bootloader)	partition-type:logo: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:recovery: 1000000
(bootloader)	partition-type:recovery: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:boot: 1000000
(bootloader)	partition-type:boot: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:para: 80000
(bootloader)	partition-type:para: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:lk: 80000
(bootloader)	partition-type:lk: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:protect2: a00000
(bootloader)	partition-type:protect2: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:protect1: a00000
(bootloader)	partition-type:protect1: ext4
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:nvram: 500000
(bootloader)	partition-type:nvram: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:proinfo: 300000
(bootloader)	partition-type:proinfo: raw data
(bootloader)	version-bootloader: porridge-n-g5d27d03
(bootloader)	partition-size:preloader: 40000
(bootloader)	partition-type:preloader: raw data
(bootloader)	off-mode-charge: 1
(bootloader)	warranty: yes
(bootloader)	unlocked: no
(bootloader)	secure: yes
(bootloader)	kernel: lk
(bootloader)	product: PORRIDGE
(bootloader)	version-preloader: 0.1.00
(bootloader)	version: 0.5
all: Done!!
fastboot: usage: unknown command info