It was more or less a clone of Opera mini (https://en.wikipedia.org/wiki/Bolt_browser, http://cellphonequick.com/bolt-browser-3-0-now-available-at-...) running on Webkit (and some people argue that Opera should do it too).

bolt renders webpages like firefox on Pc.... i don't see how it clones opera mini

The strength of Opera mini are Opera's servers that precompute and massively shrink any web page for you[1] using their proprietary OBML. So did Bolt[2]. Firefox on PC don't use any Mozilla servers to render the page for you. Neither does Firefox on Mobile. These really are two classes of web browsers.

[1] https://en.wikipedia.org/wiki/Opera_Mini#Functionality

[2] https://en.wikipedia.org/wiki/Bolt_browser#Data_compression

It's the first time I've read about this browser, has anybody experienced it, what can you tell about it?

I used this browser quite a bit. It was very good. It rendered fonts beautifully and it played media inline, without launching a new media player.

These are advantages over Opera Mini.

Also, it used Webkit as its core rendering engine (as opposed to Opera)

So it was really good!