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LP8860-Q1: Fail to unlock LP8860 NVM for burning data

Part Number: LP8860-Q1

Tool/software:

I try to write sequentially 0x08, 0xBA, 0xEF into 0x1A address for unlocking the LP8860 NVM, but fail to burn data.

I read the 0x1A register, it still keep 0x80.

What could be the problem?