Ok, you have a link for the custom recovery.
Are you currently rooted?
Are you clear on ADB and have drivers installed?
Have you used EDL before (I prefer mine, at my website)?
The first task is to write rec.img to recovery.
You should figure out which slot you are on or just flash to both.
Code:
adb shell
getprop|grep suffix
You can flash with dd or fastboot (bootloader) if it still supports the command.
If not you can use EDL.
Then you need to go to recovery.
Code:
adb reboot recovery
It should make a white screen after flashing some sort of logo.
You should have ADB.
Code:
adb devices
12345678 device
adb shell
# id
root
# start ttyscreen
You should get some text on the screen.
It should look pretty and be right side up.
If you copy/paste any text put it inside [code] and [/code]