[Android] AndDiSa:
[MENTION=5708792]gipsy.danger[/MENTION] thanks for the hint. I had to solve two issues: the productId changed and the device was not authorized. Using unsecure adb helped to get some light into the dark.

Those are the error messages I can find in the log and then it's blocked on a black screen ... :(

08-19 09:00:01.890 362 362 E hwservicemanager: BINDER_SET_INHERIT_FIFO_PRIO failed with error -1
08-19 09:00:01.935 364 376 E vold : Failed to chmod /data/system_ce/0: No such file or directory
08-19 09:00:01.935 364 376 E vold : Failed to chmod /data/misc_ce/0: No such file or directory
08-19 09:00:01.935 364 376 E vold : Failed to chmod /data/media/0: No such file or directory
08-19 09:00:02.151 400 400 E QSEECOMD: : Listener: index = 0, hierarchy = 0
08-19 09:00:02.155 406 406 E PerMgrProxy: Starting pm-proxy service
08-19 09:00:02.156 400 400 E DrmLibRpmb: rpmb_init succeeded! with ret = 0
08-19 09:00:02.156 400 400 E QSEECOMD: : Listener: index = 1, hierarchy = 0
08-19 09:00:02.159 400 400 E SSD : ssd_init_service succeeded!
08-19 09:00:02.159 400 400 E QSEECOMD: : Listener: index = 2, hierarchy = 0
08-19 09:00:02.190 400 400 E QSEECOMD: : Init dlopen(libsecureui.so, RLTD_NOW) is failed....
08-19 09:00:02.191 418 418 E QSEECOMD: : Listener: index = 0, hierarchy = 1
08-19 09:00:02.193 418 418 E QSEECOMD: : Listener: index = 1, hierarchy = 1
08-19 09:00:02.196 418 418 E QSEECOMD: : Listener: index = 2, hierarchy = 1
08-19 09:00:02.202 418 418 E QSEECOMD: : Init dlopen(libsecureui.so, RLTD_NOW) is failed....
08-19 09:00:02.202 418 418 E QSEECOMD: : Listener: index = 3, hierarchy = 1
08-19 09:00:02.205 418 418 E QSEECOMD: : Listener: index = 4, hierarchy = 1
08-19 09:00:02.207 418 418 E QSEECOMD: : Listener: index = 5, hierarchy = 1
08-19 09:00:02.219 418 418 E QSEECOMD: : Listener: index = 6, hierarchy = 1
08-19 09:00:02.219 418 418 E QSEECOMD: : Init dlopen(libqisl.so, RLTD_NOW) is failed....
08-19 09:00:02.219 418 418 E QSEECOMD: : Listener: index = 7, hierarchy = 1
08-19 09:00:02.219 418 418 E QSEECOMD: : Init dlopen(libGPreqcancel.so, RLTD_NOW) is failed....
08-19 09:00:02.220 418 418 E QSEECOMAPI: : Error::Cannot open the file /firmware/image/keymaste.mdt errno = 2
08-19 09:00:02.220 418 418 E QSEECOMAPI: : Error::Loading image failed with ret = -1
08-19 09:00:02.514 402 402 E qdutils : getPluggableNode: Failed to find HDMI node.
08-19 09:00:02.514 402 402 E qdutils : getPluggableNode: Failed to find HDMI node.
08-19 09:00:02.515 407 407 E Diag_Lib: Diag_LSM_Init: Failed to open handle to diag driver, error = 13
08-19 09:00:02.515 407 407 E PPDaemon: Diag_LSM_Init() failed.
08-19 09:00:02.515 407 407 E PPDaemon: Initialization diag library failed
08-19 09:00:02.515 407 407 E PPDaemon: Failed to open file descriptors and register diag lib
08-19 09:00:02.515 407 407 E PPDaemon: Unable to initialize DCM
08-19 09:00:02.521 402 402 E qdhwcomposer: Unknown display attribute 6
08-19 09:00:02.521 402 444 E qdhwcomposer: vsync_loop:unable to open event node for dpy=0 event=3, No such file or directory
08-19 09:00:03.156 361 361 E SELinux : avc: denied { find } for service=vendor.qcom.PeripheralManager pid=406 uid=1000 scontext=u:r:init:s0 tcontext=u:object_r:binder_per_mgr_service:s0 tclass=service_manager permissive=1
08-19 09:00:03.359 399 413 E PerMgrSrv: power on modem failed /dev/subsys_modem: Out of memory
08-19 09:00:07.215 389 389 E sound_trigger_platform: platform_stdev_init: ERROR. Unable to open the mixer, aborting
08-19 09:00:07.215 389 389 E sound_trigger_hw: stdev_open: ERROR. platform init failed
08-19 09:00:07.215 389 389 E SoundTriggerHalImpl: couldn't open sound trigger hw device in sound_trigger.primary (No such device)