the instructions in english:
Caution: Running instructions below at your own risk. The probability that the process to a 500 - €-leading paperweight, is indeed low but not zero.
Phone with Nodo (7392), 7661 (Beta Developer) or 7712 (Developer Beta Refresh)
PC with at least 20 GB of free disk space on C:
external hard drive or USB flash drive with up to 16 GB of free space
1.5 - 2 hours
1st Contents (all subdirectories of this folder) on the local computer, copy, installation and flashing from there please, not the share.
2nd If the Zune software on the PC is not on stand 4.8.2134.0: Zune software install from the PC de-
3rd Zune beta version (4.8.2134.0) from the Zune install directory (StartZuneLocal.exe)
4th If necessary. and the flashing tool "updatewp" from the folder "update tool" install (right version, 32 - or 64-bit)
5th Device via USB to the PC
6th Close Zune software, if it opens
7th If the phone is to build 7661 or 7712, go to Step 18
8th In the directory "NoDoToRC" the file "ISV_Provisioning_Live.exe" run as admin (right click, ...)
9th The provisioning tool is now starting to create a backup of the phones. This takes a while.
10th Then the phone will restart and prepared for communication with a special update server. If necessary. when you restart the PIN number, otherwise it goes no further.
11th Please close the program only if it appears that everything has gone through.
12th In the directory "C: \ Users \ <user> \ AppData \ Local \ Microsoft \ Windows Mobile Update," the newly created backup folder is in one of the cryptic name - at the latest by the date of creation. Please feel free to copy folders to a secure location (external hard disk, etc.) and keep safe! (Possibly even make two copies in two places.) Without this backup, there will be no way to bring the phone in the fall on the official update of the OEM.
Repeat: "Yes, I have kept my back for sure!"
Thanks ... continued on next page. ;)
13th Now the Zune client (with phone connected) and start looking for updates can.
14th There is now a first update of 7403 found and installed. Please if you restart the PIN and the phone never separate.
15th After 7403 the update is seamless to 7712 - the public developer beta.
16th If everything is to run through here: Congratulations, the phone is in 7712, close to RTM.
17th Zune software close.
18th Now the directory "RCToRTM" to "c: \" copy. Please only there. Thank you.
19th In the directory "c: \ RCToRTM" and change (if still connected phone) the file "ISVTo7720.bat" run as admin (see above).
20th Several updates are installed sequentially. The phone may start a few times again. If applicable, please enter the PIN.
21st If everything went smoothly: Congratulations, the phone is now on RTM!
22nd See if the phone backup is still there ... ;)
23rd Mango and use every show!