[Moto X4 Questions & Answers] Asti92:
Thank You very much! I will try to follow those instructions and get back to You :)

EDIT:

I tried to install twrp using the link you provided above.

This is what I experienced so far, using terminal in Linux (POP_OS):

sti@pop-os:~/Programs/platform-tools$ adb

Android Debug Bridge version 1.0.41

Version 30.0.4-6686687

Installed as /home/asti/Programs/platform-tools/adb

asti@pop-os:~/Programs/platform-tools$ adb devices

List of devices attached

asti@pop-os:~/Programs/platform-tools$ fastboot devices

ZY224HC647	fastboot

asti@pop-os:~/Programs/platform-tools$ fastboot boot path/to/twrp.img

fastboot: error: cannot load 'path/to/twrp.img': No such file or directory

asti@pop-os:~/Programs/platform-tools$ fastboot boot ~/Programs/platform-tools/twrp.img

Sending 'boot.img' (33432 KB) OKAY [ 0.945s]

Booting (bootloader) Failed to load/authenticate boot image: Not Found

FAILED (remote: '')

fastboot: error: Command failed

asti@pop-os:~/Programs/platform-tools$ ~/Programs/platform-tools/twrp.img

bash: /home/asti/Programs/platform-tools/twrp.img: Permission denied

asti@pop-os:~/Programs/platform-tools$ adb push ~/Programs/platform-tools/twrp.zip /sdcard

adb: error: failed to get feature set: no devices/emulators found

asti@pop-os:~/Programs/platform-tools$ fastboot boot ~/Programs/platform-tools/twrp.img

Sending 'boot.img' (33432 KB) OKAY [ 0.939s]

Booting (bootloader) Failed to load/authenticate boot image: Not Found

FAILED (remote: '')

fastboot: error: Command failed

asti@pop-os:~/Programs/platform-tools$ fastboot getvar all

(bootloader) kernel: uefi

(bootloader) version-bootloader: MBM-3.0-payton_retail-8510c11-190829

(bootloader) product: payton

(bootloader) board: payton

(bootloader) secure: yes

(bootloader) hwrev: P4

(bootloader) radio: EMEA

(bootloader) storage-type: eMMC

(bootloader) emmc: 32GB SAMSUNG DD68MB RV=08 PV=02 FV=0000000000000002

(bootloader) ufs: N/A

(bootloader) ram: 3GB SAMSUNG LP4x DIE=12Gb M5=01 M6=06 M7=00 M8=0E

(bootloader) cpu: SDM630 1.0 (6)

(bootloader) serialno: ZY224HC647

(bootloader) cid: 0x0032

(bootloader) channelid: 0x40

(bootloader) uid: 734CE21E

(bootloader) securestate: flashing_unlocked

(bootloader) verity-state: disabled (0)

(bootloader) iswarrantyvoid: yes

(bootloader) max-download-size: 536870912

(bootloader) reason: Fall-through from normal boot mode

(bootloader) imei: 356516080692333

(bootloader) meid:

(bootloader) date: 10-14-2017

(bootloader) sku: XT1900-7

(bootloader) carrier_sku:

(bootloader) battid: SNN5995A

(bootloader) battery-voltage: 4259

(bootloader) iccid:

(bootloader) cust_md5:

(bootloader) max-sparse-size: 268435456

(bootloader) ro.build.fingerprint[0]: motorola/payton_tmopl/payton:9/PPW

(bootloader) ro.build.fingerprint[1]: S29.69-37-5/63ca8:user/release-key

(bootloader) ro.build.fingerprint[2]: s

(bootloader) poweroffalarm: 0

(bootloader) ro.build.version.full[0]: Blur_Version.29.381.29.payton_tmo

(bootloader) ro.build.version.full[1]: pl.tmopl.en.US

(bootloader) ro.build.version.qcom: LA.UM.7.2.r1-04900-sdm660.0

(bootloader) version-baseband: <not found>

(bootloader) kernel.version[0]: Linux version 4.4.153-perf-g3ff98f3 (hud

(bootloader) kernel.version[1]: soncm@ilclbld153) (gcc version 4.9.x 201

(bootloader) kernel.version[2]: 50123 (prerelease) (GCC) ) #1 SMP PREEMP

(bootloader) kernel.version[3]: T Thu Aug 29 11:07:24 CDT 2019

(bootloader) git:abl: MBM-3.0-payton_retail-8510c11-190829

(bootloader) git:xbl: git:xbl

(bootloader) git:pmic: git:pmic

(bootloader) git:rpm: git:rpm

(bootloader) git:tz: git:tz

(bootloader) git:hyp: git:hyp

(bootloader) git:devcfg: git:devcfg

(bootloader) git:cmnlib: git:cmnlib

(bootloader) git:cmnlib64: git:cmnlib64

(bootloader) git:keymaster: git:keymaster

(bootloader) git:prov: git:prov

(bootloader) git:storsec: git:storsec

(bootloader) frp-state: no protection (0)

(bootloader) ro.carrier: reteu

(bootloader) current-slot:

(bootloader) running-bl-slot: _b/_b

(bootloader) running-boot-lun: 0

(bootloader) slot-count: 2

(bootloader) slot-successful:_a: yes

(bootloader) slot-successful:_b: no

(bootloader) slot-unbootable:_a: yes

(bootloader) slot-unbootable:_b: yes

(bootloader) slot-retry-count:_a: 6

(bootloader) slot-retry-count:_b: 0

all: listed above

Finished. Total time: 0.094s

I will try to re-install stock ROM and keep you updated.