Admin panel shown a 404 Not Found error after checked for updates and committed changes

[admin_sales2]

Really really need help. After checked updates and committed changes for my Magento, my admin panel shown a 404 NOT FOUND error. When I tried to load my site homepage when I clicked on the website link, it appeared a web page and shown " INDEX of / ". What happens to it? Any solutions for this issue? I am a layman. This is the first time I got this issue. Do not know how to solve it. 

[shikha1193]

Hello @admin_sales2 

Can you check if index.php and .htaccess files exists on Magento root directory ?

[admin_sales2]

Hi shikha1193,

In my Magento root directory, I only found .htaccess file. Do not have
index.php in my Magento root directory. Attach herewith a picture of it.
[image: Unicomall-root.jpg]