Help! random shutdown during printing

Basic Information:

Printer Model: diy Dayu TT
MCU / Printerboard: xiaozhen k8
Host / SBC: old phone running linux
klippy.log
klippy (1).zip (1.7 MB)

my printer shutdown randomly during printing,which cause a lot of waste,
there is no error report on screen nor webui, only mentioning"can not update mcu…"as the picture indicate.
thank you very much if anyone can help pointing out what’s wrong.

and btw how to locate the error with klippy.log.

Fill out above information and in all cases attach your klippy.log file (use zip to compress it, if too big). Pasting your printer.cfg is not needed
Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there

Describe your issue:

How do you power the Pi?
How stable is your mains voltage?

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