HTC one mini - stuck in fastboot / unlock without victory

Hello ladies and gentlemen,

i got a problem with an (no surprise) HTC One Mini.
I try to fix it for a friend - but so far without victory.

problem description
The phone is constantly in Fastboot-Mode when turned on.

*** LOCKED ***
M4_UL PVT SHIP S-ON RL
HBOOT-2.22.0000
OS-4.09.206.4
eMMc-boot 1024MB
Aug 13 2015, 23:05:25.0
FASTBOOT [USB]*
<VOL UP> to previous item
<VOL DOWN> to next item
<POWER> to select item
BOOTLOADER
REBOOT
REBOOT BOOTLOADER
POWER DOWN

*when connected to the pc

The Bootloader Menu (Recovery, Factory Reset, Clear Storage) are without any function - just sending me back to fastboot.
Image CRC output:

Code:

---

rpm: 0x0
sbl1: 0x0
sbl2: 0x0
sbl3: 0x0
tz: 0x0
radio: 0x0
hboot: 0x0
boot: 0x0
recovery: 0x0
system: 0x0

---

Tries to unlock the device via htcdev did not work up to now [the popup on the screen never pops up :(]

Here some Code Snippets:
*fastboot getvar all - output:

Code:

---

C:\adb>fastboot getvar all
(bootloader) version: 0.5
(bootloader) version-bootloader: 2.22.0000
(bootloader) version-baseband: N/A
(bootloader) version-cpld: None
(bootloader) version-microp: None
(bootloader) version-main: 4.09.206.4
(bootloader) version-misc: PVT SHIP S-ON
(bootloader) serialno: HT37W*******
(bootloader) imei: 3558********
(bootloader) meid:
(bootloader) product: m4_ul
(bootloader) platform: HBOOT-8930
(bootloader) modelid: PO5820000
(bootloader) cidnum: O2___102
(bootloader) battery-status: good
(bootloader) battery-voltage: 4237mV
(bootloader) partition-layout: Generic
(bootloader) security: on
(bootloader) build-mode: SHIP
(bootloader) boot-mode: FASTBOOT
(bootloader) commitno-bootloader: dirty-0e1af350
(bootloader) hbootpreupdate: 11
(bootloader) gencheckpt: 0
all: Done!
finished. total time: 0.131s

---

*fastboot flash unlocktoken Unlock_code.bin - output:

Code:

---

C:\adb>fastboot flash unlocktoken Unlock_code.bin
target reported max download size of 800227328 bytes
sending 'unlocktoken' (0 KB)...
OKAY [  0.169s]
writing 'unlocktoken'...
(bootloader) unlock token check successfully
OKAY [  0.010s]
finished. total time: 0.182s

---

Used tools:
PC - Windows 10
15 seconds ADB Installer v1.3
Samsung Galaxy S6 - Data/Power-Cable

Feel Free to ask for more information - ill try to provide.
Thank you in advance!

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