your bootloader might be showing the wrong info.
try to unlock it again with dev HTC. get new token. dont use the same one.
C:\Users\aleX\Desktop\Neuer Ordner (2)\fastboot_adb>fastboot flash unlocktoken "
C:\Users\aleX\Downloads\Unlock_code (1).bin"
target reported max download size of 800227328 bytes
sending 'unlocktoken' (0 KB)...
OKAY [ 0.155s]
writing 'unlocktoken'...
(bootloader) unlock token check successfully
OKAY [ 0.010s]
finished. total time: 0.166s
C:\Users\aleX\Desktop\Neuer Ordner (2)\fastboot_adb>fastboot flash boot C:\Users
\aleX\Downloads\boot.img
target reported max download size of 800227328 bytes
sending 'boot' (6824 KB)...
OKAY [ 1.038s]
writing 'boot'...
FAILED (remote: image update error)
finished. total time: 1.196s
C:\Users\aleX\Desktop\Neuer Ordner (2)\fastboot_adb>fastboot erase flashall
< waiting for device >
erasing 'flashall'...
FAILED (remote: not allowed)
finished. total time: 0.005s