demon-yo, Purely my opinion!
As I understand it, it is 4/32 whistles ACEMAX production. From them it was only 2 and whose firmware version with the bars. And more and more likely no one will deal with them. It seems to be working and the more of it that does not squeeze.
2/16 is something like a fake, which issued only 1 and firmware which is updated (10/01/2019 Information from build.prop). And the development is also likely no one will do.
At present, very few people are interested whistles (overheating, cuts the ports, the lack of manufacturers), and therefore no one will develop (to finish) software on them.
OTA SDCARD and put through a memory card. Full of information as a set.