TWRP


after reboot with power + vol(+), run
adb shell logcat> logcat.txt (error: no devices/emulators found)
 
C:\Users\HuyThinh\Downloads\adb_fastboot_tools>adb disable-verity
verity cannot be disabled/enabled - USER build
 
I'll do it again from scratch soon
 

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fastboot flash recovery twrp_phoenix_k30_3.3.1_06-01-2020_dtbo.img
fastboot boot twrp_phoenix_k30_3.3.1_06-01-2020_dtbo.img (or presspower + vol +)

Result: There are no errors. But the screen only shows a black color without booting into TWRP. Rebooting, the smartphone is still on the main screen but when pressing the "power + vol +" button, it boot to stock recovery.
cfb15270c102af6d5db8510a0c41021d.jpg