So now you should have fastboot, clockworkmod recovery image, and the ROM image
3- Put in the same folder, anywhere on your disk, all the above files and folders. In addition, copy a cmd.exe or just open one and change the "working directory" (with cd command) to the folder in which you have placed the files. You should have the below: [Folder] usb_driver [File] fastboot.exe [File] AdbWinApi.dll [File] AdbWinUsbApi.dll [File] recovery-clockwork-22.214.171.124-crespo.img [File] the_ROM_image.zip ( I got 1ada25375426.signed-soju-ota-189904.1ada2537.zip, that's the 2.3.6)
4- [IMPORTANT] Before you turn off your device back up everything you need, because all file will be erased, even those on your internal device. After that turn off the device.
5- Hold volume up and power key to boot into bootloader
6- Connect your device via usb cable, windows should recognize the device, then install the driver.
7- Either open a command prompt and "cd" to the directory in which your files are located, or if you've copied a cmd.exe into your folder, then open it, either way you have to run it as an administrator just in case.
8- Now, having your driver installed and the device still connected, type in: fastboot devices that should give the serial number of your device
9- Then type in: fastboot oem unlock go to your device and select YES (with volume button) and confirm with power button. After confirmation, go to your PC, it should display sth like (I typed the time on random): ... OKAY [10.123 s] finished. Total time: 10.123 s
10- Next you need to flash the clockworkmod recovery image, type in: fastboot flash recovery <your_clockorkmod_image_file.img> mine was "recovery-clockwork-126.96.36.199-crespo.img" so I typed: fastboot flash recovery recovery-clockwork-188.8.131.52-crespo.img
11- Next, on your device's bootloader menu, navigate using the volume keys (up and down) and select Recovery and hit the power button to confirm. Now your device should boot into recovery (the clockworkmod recovery)
12- From the recovery menu select "mounts and storage" (again navigate with volume buttons and select with power button), then select "mount USB storage" and then go to your computer on which a removable disk should pop up
13- copy your ROM.zip file from you disk over to the removable disk storage, when finished go back to your device and hit "*****Go Back*****" and again "*****Go Back*****" and now you should be on clockworkmod recovery menu, from which, select the "install zip from sdcard", then select "choose zip from sdcard", and select the your ROM.zip file you've just copied over, then select "Yes - install your_ROM_file.zip mine was "Yes - Install 1ada25375426.signed-soju-ota-189904.1ada2537.zip" Now, wait until the installation is finished (it might take a couple of minutes) When finished hit "*****Go Back*****" and then "reboot system now" Now the device should reboot with your new android OS.
14- Now you need to lock the bootloader back on, so power off your device, press volume up and the power button to boot into bootloader, connect your device via usb, and in the same cmd type in: fastboot oem lock and you'll notice on your device is changed back to "Lock State - Locked". Reboot... And that is it. Now, if you prefer to do a factory reset you can do so from the settings menu or from bootloader, but is not necessary