Hello,
I found alexvh’s firmware
https://budgetlightforum.com/t/-/31290
with ramping UI and tail-click.
I was able to flash it into my Convoy S2+ Njang driver:
https://budgetlightforum.com/t/-/30672/557
and it works properly.
Also this firmware has a big bonus: it uses off-time to switch modes (without a need to solder additional capacitor) .
In my opinion it is great feature in comparison to ordinary 3/5 stock soft.
However I had to tune source code a bit to meet my needs (not a big deal though).
At the beginning I wanted to use biscotti firmware, but for some reason it doesn’t work on my driver.