Update Joomla 2.5 to 3.8.6 without affecting current functions of website

Hi, There. We are a one of the leading and established web company providing a grade of web services, whether you are a startup or corporate company. with Innovation & Creativity, we will empower your business on a new level. I've been through the requirement and I understood the need for Project. I am very much interested to work on this project and with you. I am a certified & qualified web developer with 6 years of expertise in front-end & back-end development. I am Innovative, devoted, & a full energetic web developer, up for taking any design & development challenges. Kindly share some more information. Regards Mitesh

Hello, I have 3 years joomla admin experience and can fix this issue. Please let me know the access details for a quick start. Thanks Amita G