Samsung J6 killed with Magisk-Update? Help please!

I rootet my Samsung J6 some month before with help from xda-infos here.
Sometimes in the last weeks Magisk updatet itself. I never had any problems.

Last Saturday morning Magisk asked for update. I say ok – then I saw some seconds a DOS-like windows with activities like “flashing” “boot” etc. Then Magisk asked for “ok” to reboot.
It switched down and did not restart. Now my phone is dead.
When I press power and VOL-Down about 15 secondes then a short Samsung startscreen ist to be seen. It disappers after 5 seconds and nothing more happens. Pessing the keys pemanent then I have a loop with about 15 seconds black, 5 seconds “Samsung” and so on. Is there any possibility to bring the phone back to live?
I tried al lot of combinations of the keys. Nothing!
When plugging in USB-cable connect to powersuplly or PC sometimes a grey circle of about 2 centimeters diameter with a flash inside appears and shows the charheing.
Pressing power and VOL-Up has no effect.
I think there is no way to bring it to live again? Or can anybody help please?

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