Article 5J74A Grub 2.04 boot Problem with Notebook HD Type SSD 64G, SD 256GB

Grub 2.04 boot Problem with Notebook HD Type SSD 64G, SD 256GB

by
Physiker8
from LinuxQuestions.org on (#5J74A)
Grub 2.04 boot Problem with chinese Notebook brand TOPOSH HD Type SSD 64G, SD 256GB
after boot only opens grub prompt with minimal bash-like line editing.

Device for Bootloader installation
dev\mmcblk1 Windows Boot Manager
dev\mmcblk1p1
dev\mmcblk1p3
dev\mmcblk1p4
dev\mmcblk3SD SD64G
dev\mmcblk3p1Ubuntu 20.04.2 LTS

I tried all but first (Windows Boot Manager)
Same problem with 3 different linux Distries incl. Ubuntu 20.04.2 LTS

Tried also Debian, but "Detect and mount CD-ROM" failed
What should I do?latest?d=yIl2AUoC8zA latest?i=tx6m9LbQbg8:eARIJXGbpgg:F7zBnMy latest?i=tx6m9LbQbg8:eARIJXGbpgg:V_sGLiP latest?d=qj6IDK7rITs latest?i=tx6m9LbQbg8:eARIJXGbpgg:gIN9vFwtx6m9LbQbg8
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