Hi,
Things to check:
Did you clean the charging contacts on the back of the watch, you didn’t say? The image in Step.4 of the guide shows the 4 contacts on the back of the watch. Two will be for power (usually the two outer terminals) and the other two (inner terminals) I assume are for the USB connection via the base.
Have you checked that the charging base works OK?
Check for continuity from the charging contacts on the back of the watch through to the circuit board in the watch using an Ohmmeter in case there is a break in the charging connection between the two points.
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