Hi,
Thanks for your inquiry.
According to BMP280 datasheet, the laser marking of "2DT KS" is the right laser marking for BMP280. The letter "K" stands for BMP280 and the letter "S" stands for BMP280 with underfill 0273300436. We don't have any BMP280 that has laser marking of "xxx KL", while we used to have old version of BMP280 parts with marking of "xxx KU" and "xxx KP", etc. The Sub-con ID "S", "U" and "P" are Bosch internal tracking letter.
From the calibration parameters point of view P5, P7, P8 and P9 of the wrong BMP280 parts are too far away from the working BMP280 parts. So most likely you purchased BMP280 parts from somewhere that is not our authorized distributors.
Thanks.
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