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Hi Alex,
If the blue LED on the power supply flashes, I suspect a power supply problem. See also the labeling of the power supply. When starting up the K3, too much power is required which cannot be supplied. Can you also measure your battery voltage?
Can you power the K3 with a power bank via the USB connection? First disconnect the power supply. If this does not help, try to disconnect a part (behind camera, front camera, etc.) to see if one of these parts prevents the K3 from restarting.