installing windows 7 on MacBook Pro mid 2010 without diskdrive

hi,

i have mid 2010 MBP 13 inch. running el capitan 10.11.1 .

i had windows 7 for years, had to remove because of a crash.

i earlier installed windows through refit in lion.

now i tried through reFIND, but the process tops at starting windows.

so i tried installing through bootcamp, it doesn't allow USB support for my model, so i tried changing info.plist of bootcamp, it didn't allow first, so i went into recovery mode and disabled SIP, then comeback and changed info.plist to include my model. now after opening the bootcamp i got an option to use USB installation, but after reboot it just stops at starting installation.

plz help me.