Default installing stock rom without a usb cable

Hi,

I have an xperia go. The place I put my usb cable on was broken and since I had a custom rom in it, I didn't send it to warranty so I made some place else repair it.

now it charges but it isn't able to connect to pc. I use an ftp server to connect my phone to my pc, so if there is something like a zipped stock rom, I could use it to install the stock rom and maybe then I'd send it to warranty. (if it's not that void yet)...and if it is void, I need it anyway because 4.4.2 android rom can't play videos with a proper resolution. I mean it looks great only with the center mode of the video player, with fit to screen, crop modes the image sucks.

there was a similar question answered but that answer doesn't work with xgo.