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OTA (over the air) update fix ------------------------------------------------
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If you updated the phone over the air (WLAN, 2G/3G) you can't permanently
flash the vulnerable recovery anymore, because the OTA update has a script
incuded that overwrites the recovery if it was replaced somehow.

This script includes a fix for that by deleting the script that updates the
recovery. To get that script running, try the following method:

01. Copy this script package onto your SD card. DON'T EXTRACT THE UPDATE.ZIP!
02. Boot your phone into the boot loader by holding D-PAD up while switching
    it on. You should enter the boot loader 90.7x. Keep that version of the
    boot loader in mind - we need that information later - to be precise:
    remember if the boot loader is 90.78 (or higher) or not.
03. Connect the phone via USB with your PC - RSD Lite and all needed drivers
    should be already installed previously and the PC restartet afterwards.
04. Start RSD lite. RSD Lite should detect your phone in the list below.
05. Load and extract the vulnerable recovery if you didn't yet. The vulnerable
    recovery is a .SBF file with a size of 3-4 MB.
06. Click onto [...] in RSD Lite and load the SBF file of the vulnerable
    recovery
07. Click 'Flash'
08. Now be quick! The flash of the recovery goes on very quickly. While the
    phone got flashed, it reboots. Press and hold D-Pad up as soon as the
    screen goes black and keep D-PAD up pressed until you're back in the boot
    loader again.
09. RSD Lite displays 'PASS'
10. Now switch off the phone
11. Now we need the information about the boot loader you're asked to remember
    previously. If you have 90.78 or higher, press and hold X on the keyboard,
    otherwise press and hold the camera key. While you hold X or the camera
    key, switch on the phone, but keep the key pressed until you see an
    explaination mark [/!\]. Now release all pressed keys and press VOLUME
    UP + CAMERA once. You shuld get into recovery now.
12. Select "apply update.zip" by pressing D-PAD right/left (witch is then up/
    down since the phone is twisted 90 degrees clockwise in recovery mode).
    and D-PAD center to select.
13. The script should boot-up and inform you that it has removed that nasty
    script, that flashes recovery.
    
Now you can reboot as often as you like without the risk of the recovery being
overwritten.