Hey, i do face the same issues.
I bought the mouse like few month ago (This year though, haha)
So someone, here post a solution.
p/s: you can check the comment logs.
So, The Mouse firmware for model
Tt eSPORTS IRIS RGB HATSUNE MIKU Edition,
When you click update now, it instantly died correct.
But check this link out: https://drive.google.com/open?id=1voGuwm1daSZvXEc6wa8_lfnrxovsjXeQ
The given link from, Jason1224 (Thanks for the link)
They gave out firmware update manually,
Download it, extract.
but you might wanna disable your antivirus, cause it will make the installation to became unresponsive.
Just click and lauch. will be automagically work again.