[Android] Honor 8 Bootloop - only get into fastboot - Android Q&A, Help & Troubleshooting

Hi,
yesterday my Honot 8 worked fine. THen in the night it began with a bootloop, so that battery can't be loaded anymore. Now only possibility to switch it on is put a cable on it. But there is a bootloop, so that Android is starting with boot image and restarts after some seconds.
I can't get into recovery mode (Vol up + Power). Only get into fastboot mode.
Phone Locked
FRP Unlocked
IN Windows 10 i get access to fastboot.exe and the device is recognized. COmmands like "fastboot erase cache" doesn't work -> remote command not allowed.
Any chance to get it run again without factory reset? What can i test now?
Br
Mr.Vain

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I used the adb cmd "reboot fastboot", to reboot the phone and it shows up " entering the fastboot mode..." in a second , then it jump to the normal boot up again. Seems i cannot get in the fastboot mode.
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I woke up this morning and turned on my tablet, upon each startup it rebooted. What I have tried:
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Cause
I have now gotten my tablet out of the bootloop. When going into recovery after the android "No Command" I held vol + up and got a blackscreen, i found what the recovery menu is supposed to look like and tried navigating blind and hope for the best... That worked and I managed to get the factory reset after just waiting at a black screen.
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i tried to upgrade to the latest 11.0.6 global ROM and as usually I only booted to TWRP and sideloaded the ROM. Bootloader is unlocked, already flashed a lot of different stock & custom ROMs.
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