You need to let your ‘tech support’ know that a ‘NEW’ Nano will not boot a SD card from another working Nano. It appears you do something to the device that will not let it boot from a SD card unless it has just been created from sd-blob-b01.img, why? I just wasted time on the phone, customer service time generating a RMA and a week of waiting not to mention the $110.00 I didn’t need to spend had you TS person simply told me about the boot issue. Of course its not an issue for you.
Sorry for your inconvenience.
I am not very sure about your issue. When you talk about “another working nano” is it an old A02 module?