We have built boards in two different phases. The first one was a SW dev board which is a large board and the other one was actual form factor boards.
The first boards are able to be programmed flash but the second one is not.
We've been checking what is different between two boards but not successfully found a root cause yet.
One difference is the chip revision.
On the working boards, there is DA14681-01000 and on non-working boards there is DA14681-AD000.
I couldn't find what is difference on the new revision on the datasheet.
Could anyone answer the differences?
Thanks in advance.