First off you need to create a Gold Card
Use the memory card that came with the phone (I think is somehow linked to phone)!

Install Goldcard helper from market, run it and copy the CID for MMC2

This number has already been reversed so go to here, fill out the required fields.

That will then email you an image file. You can then using Gold Card Tool flash your image file to your phones SD card via the phones USB cable.

Next for the actual downgrade
You’ll need this unzipped

in a command prompt, goto the directory you unzipped to
connect the phone via USB

then:

adb push misc_version /data/local/tmp
adb push GingerBreak /data/local/tmp
adb shell chmod 777 /data/local/tmp/misc_version
adb shell chmod 777 /data/local/tmp/GingerBreak

This copies the files to the phone and changes the permissions so they will function

adb shell

This will enter the terminal for the phone

./data/local/tmp/GingerBreak

This will then temp root the phone you should now have # at the terminal prompt instead of $, which means you have higher privileges

From this point you can then run misc_version (Thanks to Blezz for the version number) This changes the version reported by the phone to 1.27.405.6, you cannot check this on the phone tho, as it will still report the other number.

cd /data/local/tmp
./misc_version -s 1.27.405.6

From here you can then install the update/downgrade from the exe, no need to dump zip files or anything. As with anything here, results may vary and I won’t be buying new hardware if it breaks yours! But it works a treat on mine. 

Note #1: best ROM is RUU_Saga_HTC_Europe_1.28.401.1_Radio_20.28b.30.0805U_38.03.02.11_M_release_177977_signed , as it’s generic version for European market. All european languges supported.

Note #2 : keep your “gold card”, don’t format it as it will be needed for future updates (OTA or RUU).

(HUGE thanx goes to sonikz & newrad67 from xda-developers.com for this perfect and easy guide).

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