Rooted Moto Z2 Play seemingly bricked after accidental OTA update. Any chance to save it?

I have had my Z2 Play for half a year, and soon after I got it I unlocked the bootloader with Motorola's official method, installed TWRP, rooted it with Magisk and installed Xposed Framework. I was on Nougat all the time and used it happily. A few months ago it started repeatedly asking to OTA update, but I just ignored the messages. Then one day, I must have accidentally pressed something, because I think it tried to update. I got a message that the update failed or something like that. The phone gradually got worse after that, randomly rebooting into TWRP. I could somehow get it to boot Android by going to the bootloader and chosing "factory mode" but mostly the modem would not work at all and the phone would not be usable. Trying to solve it, I decided to flash a whole ROM, hoping to remove all of the damage done by the botchered update. Since I already had unlocked my bootloader and TWRP, I decided to just flash a custom ROM, since I did not know if flashing stock would work with TWRP. I found some of the custom ROMs on XDA, and tried to flash them with TWRP. However, flashing would not work. I got some error code 255. I am attaching a screenshot of the error. I tried both flashing via the adb sideload method via my Mac and via USB OTG (flash drive) but I got the same result for both. Having seen this, I decided to try to relock the bootloader and restore stock firmware. I tried following this tutorial . However, that did not seem to work. Here is my fastboot output: Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot devices ZY224BLVMC fastboot Pals-MacBook-Air:platform-tools Fiksdal$ ./fasboot oem lock begin -bash: ./fasboot: No such file or directory Pals-MacBook-Air:platform-tools Fiksdal$ fastboot oem lock begin -bash: fastboot: command not found Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot oem lock begin (bootloader) WARNING: This command erases all user data. (bootloader) Please re-run this command to continue. OKAY [ 0.003s] Finished. Total time: 0.005s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot oem lock begin (bootloader) Flash valid Android images now (bootloader) Then re-run this command to lock OKAY [ 0.018s] Finished. Total time: 0.018s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash partition gpt.bin (bootloader) has-slot:partition: not found Sending 'partition' (45 KB) OKAY [ 0.008s] Writing 'partition' (bootloader) Validating 'gpt.default.xml' (bootloader) Security version downgrade (bootloader) Image primary_gpt failed validation (bootloader) Preflash validation failed (bootloader) Cancelling 'gpt.default.xml' FAILED (remote failure) Finished. Total time: 0.264s Pals-MacBook-Air:platform-tools Fiksdal$ sudo fastboot flash partition gpt.bin Password: sudo: fastboot: command not found Pals-MacBook-Air:platform-tools Fiksdal$ sudo ./fastboot flash partition gpt.bin (bootloader) has-slot:partition: not found Sending 'partition' (45 KB) OKAY [ 0.005s] Writing 'partition' (bootloader) Validating 'gpt.default.xml' (bootloader) Security version downgrade (bootloader) Image primary_gpt failed validation (bootloader) Preflash validation failed (bootloader) Cancelling 'gpt.default.xml' FAILED (remote failure) Finished. Total time: 0.259s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash bootloader bootloader.img (bootloader) has-slot:bootloader: not found Sending 'bootloader' (5115 KB) OKAY [ 0.209s] Writing 'bootloader' (bootloader) Validating 'bootloader.default.xml' (bootloader) Committing 'bootloader.default.xml' (bootloader) - flashing 'emmc_appsboot.mbn' to 'aboot' (bootloader) - flashing 'rpm.mbn' to 'rpm' (bootloader) - flashing 'tz.mbn' to 'tz' (bootloader) - flashing 'devcfg.mbn' to 'devcfg' (bootloader) - flashing 'cmnlib.mbn' to 'cmnlib' (bootloader) - flashing 'cmnlib64.mbn' to 'cmnlib64' (bootloader) - flashing 'keymaster.mbn' to 'keymaster' (bootloader) - flashing 'prov.mbn' to 'prov' (bootloader) - flashing 'sbl1.mbn' to 'sbl1' OKAY [ 0.548s] Finished. Total time: 0.943s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash logo logo.bin (bootloader) has-slot:logo: not found Sending 'logo' (2192 KB) OKAY [ 0.093s] Writing 'logo' OKAY [ 0.066s] Finished. Total time: 0.344s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash recovery recovery.img (bootloader) has-slot:recovery: not found Sending 'recovery' (20580 KB) OKAY [ 0.838s] Writing 'recovery' (bootloader) Security version downgrade (bootloader) Image recovery failed validation (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 1.234s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash recovery recovery.img (bootloader) has-slot:recovery: not found Sending 'recovery' (20580 KB) OKAY [ 0.729s] Writing 'recovery' (bootloader) Security version downgrade (bootloader) Image recovery failed validation (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 1.125s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash dsp adspso.bin (bootloader) has-slot:dsp: not found Sending 'dsp' (16384 KB) OKAY [ 0.667s] Writing 'dsp' OKAY [ 0.132s] Finished. Total time: 0.984s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash oem oem.img (bootloader) has-slot:oem: not found Sending 'oem' (232923 KB) OKAY [ 10.302s] Writing 'oem' (bootloader) Security version downgrade (bootloader) Image o failed validation (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 10.554s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.0 (bootloader) has-slot:system: not found Sending 'system' (517135 KB) OKAY [ 20.549s] Writing 'system' (bootloader) Security version downgrade (bootloader) Image s failed validation (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.1 (bootloader) has-slot:system: not found Sending 'system' (522979 KB) OKAY [ 20.458s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 20.674s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.2 (bootloader) has-slot:system: not found Sending 'system' (524215 KB) OKAY [ 20.487s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 20.704s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.3 (bootloader) has-slot:system: not found Sending 'system' (521087 KB) OKAY [ 19.126s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 19.330s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.4 (bootloader) has-slot:system: not found Sending 'system' (518083 KB) OKAY [ 19.082s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 19.295s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.5 (bootloader) has-slot:system: not found Sending 'system' (515569 KB) OKAY [ 18.974s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 19.192s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.6 (bootloader) has-slot:system: not found Sending 'system' (250209 KB) OKAY [ 9.380s] Writing 'system' (bootloader) Invalid signed image (bootloader) Preflash validation failed FAILED (remote failure) Finished. Total time: 9.579s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash system system.img_sparsechunk.7 (bootloader) has-slot:system: not found fastboot: error: cannot load 'system.img_sparsechunk.7': No such file or directory Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash modem NON-HLOS.bin (bootloader) has-slot:modem: not found Sending 'modem' (75092 KB) OKAY [ 2.888s] Writing 'modem' OKAY [ 1.878s] Finished. Total time: 4.954s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase modemst1 (bootloader) has-slot:modemst1: not found Erasing 'modemst1' OKAY [ 0.020s] Finished. Total time: 0.210s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase modemst2 (bootloader) has-slot:modemst2: not found Erasing 'modemst2' OKAY [ 0.020s] Finished. Total time: 0.210s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot flash fsg fsg.mbn (bootloader) has-slot:fsg: not found Sending 'fsg' (2932 KB) OKAY [ 0.114s] Writing 'fsg' OKAY [ 0.065s] Finished. Total time: 0.364s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase cache (bootloader) has-slot:cache: not found Erasing 'cache' OKAY [ 0.016s] Finished. Total time: 0.206s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase userdata (bootloader) has-slot:userdata: not found Erasing 'userdata' OKAY [ 2.252s] Finished. Total time: 2.442s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase customize (bootloader) has-slot:customize: not found Erasing 'customize' (bootloader) Permission denied FAILED (remote failure) Finished. Total time: 0.194s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase customize (bootloader) has-slot:customize: not found Erasing 'customize' (bootloader) Permission denied FAILED (remote failure) Finished. Total time: 0.194s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot erase clogo (bootloader) has-slot:clogo: not found Erasing 'clogo' (bootloader) Permission denied FAILED (remote failure) Finished. Total time: 0.192s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot oem lock (bootloader) Still require signed boot.img OKAY [ 0.003s] Finished. Total time: 0.003s Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot reboot Rebooting Finished. Total time: 0.005s This seemed to do nothing to my device. I wondered if maybe the bootloader was in some sort of locked/unlocked limbo, so I tried to unlock the bootloader again using the key I got from Moto by email. That did not work either. Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot oem unlock THECODEFORMYDEVICE (bootloader) invalid boot state OKAY [ 0.005s] Finished. Total time: 0.008s So I seem to be getting nowhere. There has to be some way to totally wipe everything, to get a fresh start? I do not care if I have to restore stock firmware, stock bootloader, whatever. I just want to be able to at least use my phone somehow. Is my device totally bricked? Is there nothing I can do? I used adb and fastboot on macOS High Sierra. At the request of @acejavelin, I am posting some more information: Pals-MacBook-Air:platform-tools Fiksdal$ ./fastboot getvar all (bootloader) version: 0.5 (bootloader) version-bootloader: moto-msm8953-C0.C7 (bootloader) product: albus (bootloader) board: albus (bootloader) secure: yes (bootloader) hwrev: P4 (bootloader) radio: 3 (bootloader) storage-type: emmc (bootloader) emmc: 64GB SKHYNIX HCG8a4 RV=08 PV=A2 FV=00000000000000A2 (bootloader) ram: 4GB SKHYNIX LP3 DIE=8Gb M5=06 M6=03 M7=00 M8=5F (bootloader) cpu: MSM8953 (bootloader) serialno: ZY224BLVMC (bootloader) cid: 0x0032 (bootloader) channelid: 0x40 (bootloader) uid: B5E66CBA00000000000000000000 (bootloader) securestate: flashing_unlocked (bootloader) verity-state: enforcing (bootloader) iswarrantyvoid: yes (bootloader) max-download-size: 536870912 (bootloader) reason: Last time flashing failed (bootloader) imei: ***************** (bootloader) meid: (bootloader) date: 07-29-2017 (bootloader) sku: XT1710-09 (bootloader) battid: SNN5983B (bootloader) iccid: (bootloader) cust_md5: (bootloader) max-sparse-size: 268435456 (bootloader) current-time: "Sat Jan 3 17:37:25 UTC 1970" (bootloader) ro.build.fingerprint: motorola/albus/albus:7.1.1/NPSS26. (bootloader) ro.build.fingerprint: 118-19-18/24:user/release-keys (bootloader) poweroffalarm: 1 (bootloader) ro.build.version.full: Blur_Version.26.261.24.albus.reta (bootloader) ro.build.version.full: il.en.US (bootloader) ro.build.version.qcom: LA.UM.5.6.r1-03800-89xx.0 (bootloader) version-baseband: M8953P_23.33.07.34R ALBUS_EMEADSDS_CUST (bootloader) kernel.version: Linux version 3.18.31-perf-gf3fa6ef (hud (bootloader) kernel.version: soncm@ilclbld83) (gcc version 4.9 201501 (bootloader) kernel.version[2] : 23 (prerelease) (GCC) ) #1 SMP PREEMPT T (bootloader) kernel.version: ue Dec 5 00:03:05 CST 2017 (bootloader) sbl1.git: git=MBM-NG-VC0.C7-0-ge9cd975 (bootloader) rpm.git: git=5578f74 (bootloader) tz.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) devcfg.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) keymaster.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) cmnlib.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) cmnlib64.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) prov.git: git=MBM-NG-VC2.06-0-g82f94af-dirty (bootloader) aboot.git: git=MBM-NG-VC0.C7-0-gb6d4956 (bootloader) qe: qe 1/1 (bootloader) frp-state: no protection (77) (bootloader) ro.carrier: reteu all: listed above Finished. Total time: 0.034s