[General Topics] Iamd55:
Thank you for your useful info, however, it seems like my device's bootloader is still locked. The result I got from fastboot getvar all command is listed here:

(bootloader) max-download-size: 0x8000000

(bootloader) partition-size:flashinfo: 1000000

(bootloader) partition-type:flashinfo: raw data

(bootloader) partition-size:userdata: 32000000

(bootloader) partition-type:userdata: ext4

(bootloader) partition-size:cache: 1b000000

(bootloader) partition-type:cache: ext4

(bootloader) partition-size:system: a0000000

(bootloader) partition-type:system: ext4

(bootloader) partition-size:vendor: 29000000

(bootloader) partition-type:vendor: raw data

(bootloader) partition-size:keystore: b00000

(bootloader) partition-type:keystore: raw data

(bootloader) partition-size:tee2: 500000

(bootloader) partition-type:tee2: raw data

(bootloader) partition-size:tee1: 500000

(bootloader) partition-type:tee1: raw data

(bootloader) partition-size:odmdtbo: 1000000

(bootloader) partition-type:odmdtbo: raw data

(bootloader) partition-size:logo: 800000

(bootloader) partition-type:logo: raw data

(bootloader) partition-size:boot: 1000000

(bootloader) partition-type:boot: raw data

(bootloader) partition-size:lk2: 100000

(bootloader) partition-type:lk2: raw data

(bootloader) partition-size:lk: 100000

(bootloader) partition-type:lk: raw data

(bootloader) partition-size:items: 100000

(bootloader) partition-type:items: raw data

(bootloader) partition-size:nvram: 500000

(bootloader) partition-type:nvram: raw data

(bootloader) partition-size:scp2: 100000

(bootloader) partition-type:scp2: raw data

(bootloader) partition-size:scp1: 100000

(bootloader) partition-type:scp1: raw data

(bootloader) partition-size:md3img: 500000

(bootloader) partition-type:md3img: raw data

(bootloader) partition-size:md1arm7: 300000

(bootloader) partition-type:md1arm7: raw data

(bootloader) partition-size:md1dsp: 400000

(bootloader) partition-type:md1dsp: raw data

(bootloader) partition-size:md1img: 1800000

(bootloader) partition-type:md1img: raw data

(bootloader) partition-size:proinfo: 300000

(bootloader) partition-type:proinfo: raw data

(bootloader) partition-size:oemkeystore: 200000

(bootloader) partition-type:oemkeystore: raw data

(bootloader) partition-size:seccfg: 800000

(bootloader) partition-type:seccfg: raw data

(bootloader) partition-size:protect2: c78000

(bootloader) partition-type:protect2: ext4

(bootloader) partition-size:protect1: 800000

(bootloader) partition-type:protect1: ext4

(bootloader) partition-size:metadata: 2000000

(bootloader) partition-type:metadata: raw data

(bootloader) partition-size:nvdata: 2000000

(bootloader) partition-type:nvdata: ext4

(bootloader) partition-size:nvcfg: 800000

(bootloader) partition-type:nvcfg: ext4

(bootloader) partition-size:frp: 100000

(bootloader) partition-type:frp: raw data

(bootloader) partition-size:expdb: a00000

(bootloader) partition-type:expdb: raw data

(bootloader) partition-size:para: 80000

(bootloader) partition-type:para: raw data

(bootloader) partition-size:recovery: 1000000

(bootloader) partition-type:recovery: raw data

(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: X20L_WQXGA_COB_V4

(bootloader) version-preloader:

(bootloader) version: 0.5

---------- Post added at 05:58 AM ---------- Previous post was at 05:55 AM ----------

I have checked and found that the OEM unlocking is off.