[Sony Xperia XZ2 ROMs, Kernels, Recoveries, & Other] Katzenstreu:
Fastboot Version (Linux): 28.0.2-5303910

Bootloader Version: (bootloader) version-bootloader:1310-7079_X_Boot_SDM845_LA2.0_P_118

root@Tim-Notebook-Linux:/home/tim/Schreibtisch/platform-tools# ./fastboot getvar all

< waiting for any device >

(bootloader) hw-revision:20001

(bootloader) unlocked:yes

(bootloader) off-mode-charge:0

(bootloader) charger-screen-enabled:0

(bootloader) battery-soc-ok:yes

(bootloader) battery-voltage:4309

(bootloader) version-baseband:1311-7915_52.0.A.8.25

(bootloader) version-bootloader:1310-7079_X_Boot_SDM845_LA2.0_P_118

(bootloader) erase-block-size: 0x1000

(bootloader) logical-block-size: 0x1000

(bootloader) variant:SDM UFS

(bootloader) partition-type:xbl_config_b:raw

(bootloader) partition-size:xbl_config_b: 0x20000

(bootloader) partition-type:xbl_b:raw

(bootloader) partition-size:xbl_b: 0x3D5000

(bootloader) partition-type:xbl_config_a:raw

(bootloader) partition-size:xbl_config_a: 0x20000

(bootloader) partition-type:xbl_a:raw

(bootloader) partition-size:xbl_a: 0x3D5000

(bootloader) partition-type:rddata:raw

(bootloader) partition-size:rddata: 0x1400000

(bootloader) partition-type:userdata:ext4

(bootloader) partition-size:userdata: 0xBFA96C000

(bootloader) partition-type:fsc:raw

(bootloader) partition-size:fsc: 0x20000

(bootloader) partition-type:fsmetadata:raw

(bootloader) partition-size:fsmetadata: 0x101000

(bootloader) partition-type:Qnovo:raw

(bootloader) partition-size:Qnovo: 0x1800000

(bootloader) partition-type:diag:raw

(bootloader) partition-size:diag: 0x2000000

(bootloader) partition-type:appslog:raw

(bootloader) partition-size:appslog: 0x1000000

(bootloader) partition-type:frp:raw

(bootloader) partition-size:frp: 0x80000

(bootloader) partition-type:keystore:raw

(bootloader) partition-size:keystore: 0x80000

(bootloader) partition-type:misc:raw

(bootloader) partition-size:misc: 0x100000

(bootloader) partition-type:cdt:raw

(bootloader) partition-size:cdt: 0x20000

(bootloader) partition-type:fsg:raw

(bootloader) partition-size:fsg: 0x200000

(bootloader) partition-type:modemst2:raw

(bootloader) partition-size:modemst2: 0x200000

(bootloader) partition-type:modemst1:raw

(bootloader) partition-size:modemst1: 0x200000

(bootloader) partition-type:logdump:raw

(bootloader) partition-size:logdump: 0x4000000

(bootloader) partition-type:logfs:raw

(bootloader) partition-size:logfs: 0x800000

(bootloader) partition-type:toolsfv:raw

(bootloader) partition-size:toolsfv: 0x100000

(bootloader) partition-type:limits:raw

(bootloader) partition-size:limits: 0x1000

(bootloader) partition-type:spunvm:raw

(bootloader) partition-size:spunvm: 0x800000

(bootloader) partition-type:msadp:raw

(bootloader) partition-size:msadp: 0x40000

(bootloader) partition-type:apdp:raw

(bootloader) partition-size:apdp: 0x40000

(bootloader) partition-type:sec:raw

(bootloader) partition-size:sec: 0x4000

(bootloader) partition-type:system_b:ext4

(bootloader) partition-size:system_b: 0xFC000000

(bootloader) partition-type:vendor_b:raw

(bootloader) partition-size:vendor_b: 0x40000000

(bootloader) partition-type:oem_b:raw

(bootloader) partition-size:oem_b: 0x19000000

(bootloader) partition-type:dtbo_b:raw

(bootloader) partition-size:dtbo_b: 0x800000

(bootloader) partition-type:vbmeta_b:raw

(bootloader) partition-size:vbmeta_b: 0x10000

(bootloader) partition-type:rdimage_b:raw

(bootloader) partition-size:rdimage_b: 0x1400000

(bootloader) partition-type:boot_b:raw

(bootloader) partition-size:boot_b: 0x4000000

(bootloader) partition-type:dsp_b:raw

(bootloader) partition-size:dsp_b: 0x2000000

(bootloader) partition-type:bluetooth_b:raw

(bootloader) partition-size:bluetooth_b: 0x100000

(bootloader) partition-type:modem_b:raw

(bootloader) partition-size:modem_b: 0xF000000

(bootloader) partition-type:system_a:ext4

(bootloader) partition-size:system_a: 0xFC000000

(bootloader) partition-type:vendor_a:raw

(bootloader) partition-size:vendor_a: 0x40000000

(bootloader) partition-type:oem_a:raw

(bootloader) partition-size:oem_a: 0x19000000

(bootloader) partition-type:dtbo_a:raw

(bootloader) partition-size:dtbo_a: 0x800000

(bootloader) partition-type:vbmeta_a:raw

(bootloader) partition-size:vbmeta_a: 0x10000

(bootloader) partition-type:rdimage_a:raw

(bootloader) partition-size:rdimage_a: 0x1400000

(bootloader) partition-type:boot_a:raw

(bootloader) partition-size:boot_a: 0x4000000

(bootloader) partition-type:dsp_a:raw

(bootloader) partition-size:dsp_a: 0x2000000

(bootloader) partition-type:bluetooth_a:raw

(bootloader) partition-size:bluetooth_a: 0x100000

(bootloader) partition-type:modem_a:raw

(bootloader) partition-size:modem_a: 0xF000000

(bootloader) partition-type:tzxfl_b:raw

(bootloader) partition-size:tzxfl_b: 0x80000

(bootloader) partition-type:tzxflattest_b:raw

(bootloader) partition-size:tzxflattest_b: 0x80000

(bootloader) partition-type:xfl_b:raw

(bootloader) partition-size:xfl_b: 0x1E00000

(bootloader) partition-type:qupfw_b:raw

(bootloader) partition-size:qupfw_b: 0x10000

(bootloader) partition-type:devcfg_b:raw

(bootloader) partition-size:devcfg_b: 0x20000

(bootloader) partition-type:cmnlib64_b:raw

(bootloader) partition-size:cmnlib64_b: 0x80000

(bootloader) partition-type:cmnlib_b:raw

(bootloader) partition-size:cmnlib_b: 0x80000

(bootloader) partition-type:keymaster_b:raw

(bootloader) partition-size:keymaster_b: 0x80000

(bootloader) partition-type:abl_b:raw

(bootloader) partition-size:abl_b: 0x180000

(bootloader) partition-type:hyp_b:raw

(bootloader) partition-size:hyp_b: 0x80000

(bootloader) partition-type:tz_b:raw

(bootloader) partition-size:tz_b: 0x200000

(bootloader) partition-type:aop_b:raw

(bootloader) partition-size:aop_b: 0x80000

(bootloader) partition-type:tzxfl_a:raw

(bootloader) partition-size:tzxfl_a: 0x80000

(bootloader) partition-type:tzxflattest_a:raw

(bootloader) partition-size:tzxflattest_a: 0x80000

(bootloader) partition-type:xfl_a:raw

(bootloader) partition-size:xfl_a: 0x1E00000

(bootloader) partition-type:qupfw_a:raw

(bootloader) partition-size:qupfw_a: 0x10000

(bootloader) partition-type:devcfg_a:raw

(bootloader) partition-size:devcfg_a: 0x20000

(bootloader) partition-type:cmnlib64_a:raw

(bootloader) partition-size:cmnlib64_a: 0x80000

(bootloader) partition-type:cmnlib_a:raw

(bootloader) partition-size:cmnlib_a: 0x80000

(bootloader) partition-type:keymaster_a:raw

(bootloader) partition-size:keymaster_a: 0x80000

(bootloader) partition-type:abl_a:raw

(bootloader) partition-size:abl_a: 0x180000

(bootloader) partition-type:hyp_a:raw

(bootloader) partition-size:hyp_a: 0x80000

(bootloader) partition-type:tz_a:raw

(bootloader) partition-size:tz_a: 0x200000

(bootloader) partition-type:aop_a:raw

(bootloader) partition-size:aop_a: 0x80000

(bootloader) partition-type:ddr:raw

(bootloader) partition-size:ddr: 0x100000

(bootloader) partition-type:devinfo:raw

(bootloader) partition-size:devinfo: 0x1000

(bootloader) partition-type:ssd:raw

(bootloader) partition-size:ssd: 0x2000

(bootloader) partition-type:persist:raw

(bootloader) partition-size:persist: 0x2000000

(bootloader) partition-type:xflkeystorebak:raw

(bootloader) partition-size:xflkeystorebak: 0x20000

(bootloader) partition-type:xflkeystore:raw

(bootloader) partition-size:xflkeystore: 0x20000

(bootloader) partition-type:LTALabel:raw

(bootloader) partition-size:LTALabel: 0x1000000

(bootloader) partition-type:TA:raw

(bootloader) partition-size:TA: 0x200000

(bootloader) has-slot:modem:yes

(bootloader) has-slot:system:yes

(bootloader) current-slot:a

(bootloader) has-slot:boot:yes

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

(bootloader) slot-unbootable:b:no

(bootloader) slot-successful:b:no

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

(bootloader) slot-unbootable:a:no

(bootloader) slot-successful:a:yes

(bootloader) slot-count:2

(bootloader) secure:no

(bootloader) serialno: DELETED

(bootloader) serial:b2da9353

(bootloader) product:H8216

(bootloader) max-download-size:536870912

(bootloader) kernel:uefi

Yes, I waited a while seeing the black screen for starting TWRP.

It seems I've to try newflasher.