VIAVI TestCenter: Why can't I write to I2C bus in the L1 browser developer mode option

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VIAVI TestCenter: Why can't I write to I2C bus in the L1 browser developer mode option
• When using CR4 QSFP28 copper DACS the registers to write to are not available in the device. • Was able to write and read back when tested using SR4 and LR4 QSFP28 transceivers. •