Problem solved.
To change the I2C address of a Kmeter one need to write to register 0x08 the new address (one byte) and to register 0x09 the same address but with the bits converted (1 is 0 , 0 is 1).
After writing cycle the power.
Thanks to M5 technical help team.
M
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RE: Change the I2C address of a Kmeter Unit
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