Help Why doesn't my phone turn on or charge?

[Hamidreza A]

Hi

I installed CWM custom recovery to update my y300 to Android version 4.4.4. Before that i had TWRP custom recovery and backup of my phone whit it.
When I wanted to install TWRP again to restore my data, my phone doesn't turn on and doesn't charge. I gave it to repair store to fix this problem, and after that he fixed it he said "I boot your phone...".
I want to know why my phone didn't work after that action?!
I would appreciated if anyone can tell me why this happened.
English isn’t my first language, so please excuse any mistakes. I’m working on improving my English.

Thank you