Problem with flashing autoloader ADB796 Oreo on PRD-63117-036

I have the following Problem:

My Phone is currently in Fastboot mode and i started flashing the Autoloader as Always manually.

here is the log:

C:\ADB>fastboot flash tz tz.mbn
Sending 'tz' (1523 KB) OKAY [ 0.078s]
Writing 'tz' OKAY [ 0.074s]
Finished. Total time: 0.184s

C:\ADB>fastboot flash devcfg devcfg.mbn
Sending 'devcfg' (40 KB) OKAY [ 0.057s]
Writing 'devcfg' OKAY [ 0.067s]
Finished. Total time: 0.150s

C:\ADB>fastboot flash rpm rpm.mbn
Sending 'rpm' (170 KB) OKAY [ 0.057s]
Writing 'rpm' OKAY [ 0.067s]
Finished. Total time: 0.155s

C:\ADB>fastboot flash sbl1 sbl1_signed.mbn
Sending 'sbl1' (365 KB) OKAY [ 0.057s]
Writing 'sbl1' OKAY [ 0.069s]
Finished. Total time: 0.157s

C:\ADB>fastboot flash aboot emmc_appsboot.mbn
Sending 'aboot' (1737 KB) OKAY [ 0.347s]
Writing 'aboot' OKAY [ 0.074s]
Finished. Total time: 0.456s

C:\ADB>fastboot flash bootsig boot.img.sig
Sending 'bootsig' (0 KB) OKAY [ 0.057s]
Writing 'bootsig' OKAY [ 0.066s]
Finished. Total time: 0.157s

C:\ADB>fastboot flash recoverysig recovery.img.sig
Sending 'recoverysig' (0 KB) OKAY [ 0.057s]
Writing 'recoverysig' OKAY [ 0.067s]
Finished. Total time: 0.155s

C:\ADB>fastboot flash boot boot.img
Sending 'boot' (31744 KB) FAILED (data write failure (Unknown error))
Finished. Total time: 5.164s

What now?

Ok i was able to fix this Problem. First i used SUGAR to factory restore the KEYone (or use the Mobile Upgrade Tool). Then i tried the Installation of the Oreo Update again on my KEYone. Result: Everything works fine, no error while flashing. Bootup was at the first time rather slow, but it has settled now.