Phone stuck on boot screen.

Okay so a couple of days ago i tried updating my lenovo s60 (non-removable battery) to android lollipop, what happened is , the update was fully downloaded and the phone rebooted, the update was getting installed , after a while it got stuck on 75%, i waited upto 5-6 hours and it was still the same , so i had no option but to shut down the phone manually.
When i tried to boot it up again , it wouldn't go past the lenovo powered by android screen, this has happened to me before but in the past occurances , it would go to the second screen after the lenovo powered by android, the problem with it getting stuck on the first screen is that i cant get my phone to recovery mode, the recovery mode is where i fixed my phone when this happened before so now i have no idea on what to do since i cant get my phone into recovery and my pc doesn't detect it.
So i gave it to 2 mobile service centers hoping that they would fix my phone and they couldn't fix it too, that leaves me thinking that i can't do anything to fix my phone.
i just decided to leave a reply here so that someone could do something and help me fix my phone. i know its not hard bricked since it still turns on and gets stuck only on the first screen. but i really dont know what to do.Thank you all who take the time to read this through.
P.S: My phone isn't rooted.