moto g9 play flashing_lock and hard brick

[kaua_200621]

The phone is stuck on the Motorola logo screen, then goes to fastboot mode displaying the message "flashing locked". A stock ROM was attempted, but the device does not accept commands and says that the bootloader is locked. When trying to unlock the bootloader, it asks to enable the option in developer mode, but the phone is in hard brick. ADB and recovery attempts were unsuccessful, and it is also not possible to install a custom recovery. All of this happened after attempting to fix a soft brick issue after an update.
It should also be noted that the device had been rooted some time ago and, when turning it on, it was stuck in a bootloop but eventually booted up normally. The root had been undone well before the device was updated.
fastboot getvar all
(bootloader) kernel: uefi
(bootloader) version-bootloader: MBM-3.0-guamp_retail-252ee94a78-220503
(bootloader) product: guamp
(bootloader) board: guamp
(bootloader) secure: yes
(bootloader) hwrev: PVT
(bootloader) radio: LATAM
(bootloader) storage-type: eMMC
(bootloader) emmc: 64GB SKHYNIX hC9aP3 RV=08 PV=01 FV=0000000031303030
(bootloader) ufs: N/A
(bootloader) ram: 4GB SKHYNIX LP4x DIE=16Gb M5-M8=06 05 00 11
(bootloader) cpu: SM_KAMORTA_H 1.0
(bootloader) serialno: ZF5236M8M9
(bootloader) cid: 0x0032
(bootloader) channelid: 0x19
(bootloader) uid: 623C51AB
(bootloader) securestate: flashing_locked
(bootloader) factory-modes: disabled
(bootloader) verity-state: enforcing (0)
(bootloader) iswarrantyvoid: yes
(bootloader) max-download-size: 804464640
(bootloader) reason: Fall-through from normal boot mode (bootloader) date: 01-07-2021
(bootloader) sku: XT2083-1
(bootloader) carrier_sku: XT2083-1
(bootloader) battid: SB18C44581
(bootloader) battery-voltage: 3849
(bootloader) iccid:
(bootloader) cust_md5:
(bootloader) max-sparse-size: 268435456
(bootloader) poweroffalarm: 0
(bootloader) ro.carrier: retbr
(bootloader) ro.build.fingerprint[0]: motorola/guamp_retail/guamp:11/RPX
(bootloader) ro.build.fingerprint[1]: S31.Q2-58-17-4-8/75835:user/releas
(bootloader) ro.build.fingerprint[2]: e-keys
(bootloader) ro.build.version.qcom: LA.UM.9.15.r1-02200-KAMORTA.0
(bootloader) version-baseband: HA10_29.11.02.88R GUAMP_LATAMDSDS_CUST
(bootloader) kernel.version[0]: Linux version 4.19.157-perf+ ([email protected]
(bootloader) kernel.version[1]: roid-build) (clang version 10.0.7 for An
(bootloader) kernel.version[2]: droid NDK, GNU ld (binutils-2.27-bd24d23
(bootloader) kernel.version[3]: f) 2.27.0.20170315) #1 SMP PREEMPT Fri A
(bootloader) kernel.version[4]: pr 29 11:24:11 CDT 2022
(bootloader) git:abl: MBM-3.0-guamp_retail-252ee94a78-220503
(bootloader) frp-state: protected (144)
(bootloader) current-slot:
(bootloader) running-bl-slot: _a/_a
(bootloader) running-boot-lun: 0
(bootloader) slot-count: 2
(bootloader) slot-successful:_a: no
(bootloader) slot-successful:_b: no
(bootloader) slot-unbootable:_a: yes
(bootloader) slot-unbootable:_b: yes
(bootloader) slot-retry-count:_a: 0
(bootloader) slot-retry-count:_b: 0
(bootloader) logical-block-size: 0x200
(bootloader) erase-block-size: 0x200
(bootloader) is-userspace: no
(bootloader) pcb-part-no: SB28C98730
(bootloader) primary-display: hlt_ili9882h_video_display
(bootloader) secondary-display:
all: listed above
finished. total time: 0.250s

the command returns this
fastboot oem unlock
...
(bootloader) Check 'OEM unlocking' in Android Settings > Developer
(bootloader) Options
FAILED (remote failure)
finished. total time: 0.094s

 

[kaua_200621]

EDL mode returns this

Motorola qboot utility version 3.86
[ 0.000] Opening device: \\.\COM8
[ 0.047] Detecting device
[ 34.913] ERROR: sahara_greet_device()->change_mode()->do_hello()->IO error
[ 34.913] Check qboot_log.txt for more details
[ 34.913] Total time: 34.929s
FAILED: qb_flash_singleimage()->sahara_greet_device()->change_mode()->do_hello()->IO error