The "5N-OKC" marking on the BMI270 chip seems unusual, and it's likely not a standard identifier for the BMI270 model. Typically, BMI270 chips should have markings indicating their specific model and revision. The fact that it reports a CHIP ID of 0x26 instead of the expected 0x24 further suggests that it might not be a BMI270 or it could be a different variant or revision. Without more information, it's difficult to determine exactly what the "5N-OKC" chip is. It's possible that there was a mix-up or an error in sending the correct chips to your contract manufacturer (CM). I would recommend reaching out to your chip supplier or manufacturer to inquire about the "5N-OKC" chips and verify if they indeed sent the correct parts. If the "5N-OKC" chip is indeed an IMU-type chip and you need documentation to make the appropriate software changes, you'll need to identify the specific model or variant of the chip. Once you have that information, you can request documentation from the chip manufacturer or supplier. This documentation should include datasheets, application notes, and other relevant technical information that will help you modify your software accordingly. In the meantime, since reflowing the chips from the working boards onto the new boards resolved the issue, it's possible that there might be some inconsistency or problem with the "5N-OKC" chips themselves. However, before concluding that, it's essential to verify the identity of these chips and gather more information from your supplier or manufacturer.
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