Sorry to hear you have met the same problem with me.
How can I contact with you? Let's discuss details.
My email address: firstname.lastname@example.org
Looking forwards to further discussion with you.
I also bought some A5 chips in China and all don't work. The chips do not answer the I2C request at all. I do business with the same dealer for many years. I guess the chips are not fake, but there are some problems in Bosch manufacture and testing.
Yes, we confirmed finally with Bosch DE, the BNO055 chips we bought was from Bosch, but they are Engineering version, not Mass production version, which means you can't use them according to the datasheet.
And later we already ordered correct BNO055 for our mass production then.
But now the BNO055 Chip is so expensive, we are trying to use BMI170 to be as an alternative.
If you need service, eg, sourcing components, protpotype PCBAs or final product assembly, we can of course offer these service,
We are in ShenZhen,China.
And I'm from NOA Labs
You can find me at email@example.com
If your stock is bought from an official distributor, please contact them first and we will support you if you have some issues.
If your stocks are purchased from unofficial channel, please contact your supplier. We can't track these stocks and provide technical support.
Thanks for your understanding.