After updating the firmware on my new TinySA Ultra, it repeatedly failed self test 10 with a "Stopband Fail" message. However, it then began passing and no amount of fiddling with the connector tightness/looseness seems to be able to reproduce it. Here's the failed plot; Now that it's passing, the right hand side is consistently about the same level as the left side, a nice 15dB below the limit.
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Any suggestion about what this could indicate? I bought it before reading about clones and official sellers, but did a firmware dump before updating. It shipped with v1.4-156-g4eb315d , so I compared the dump with the downloadable .bin file of the same version, and they differ in that six bytes from 0x21E4A to 0x21E4F are 0xFF in the dump vs 0x00 in the legit .bin file, which could be normal if an .elf file was used for the original and those few bytes in between blocks were left unprogrammed.
