In brief, Dell Streak will have to upgrade from US1.6 -> EU O2 1.6 -> EU O2 2.1 -> custom rom 2.1 or 2.2 (or even 2.3)
1. Copy “O2 1.6 (build 4399).pkg” into memory card and rename it to Update.pkg
2. Turn streak off, press hold camera key + power until u see white screen (fastboot)
3. Now tap fastboot on top right corner of the screen
4. If “FASTBOOT” does not appear on the bottom left of the screen, that means the fastboot driver is not installed properly
5. Once FASTBOOT appears, on computer, goto “recovery for build 4399” folder and run “install-recovery-windows.bat”
6. After the screen of shows “done”, hold on to both volume up and down key together until the device boot into recovery mode
7. Select 2nd option and restore firmware
8. After reboot into the system, your are now in O2 1.6 firmware (build 4399)
9. Now copy “O2 2.1 (build 8105).pkg” to memory card and rename to Update.pkg
10.Turn streak off, press hold camera key + power until u see white screen (fastboot)
11.Now tap fastboot on top right corner of the screen
12.Once FASTBOOT appears, on computer, goto “recovery for build 8105” folder and run “install-recovery-windows.bat”
13.After the screen of shows “done”, hold on to both volume up and down key together until the device boot into recovery mode
14.Select 2nd option and restore firmware
15.After reboot into the system, your are now in O2 1.6 firmware (build 8105)
16.Copy “update-1.6.0.zip” in “StreakDroid 1.6.0” folder into memory card.
17.Turn streak off, press hold camera key + power until u see white screen (fastboot)
18.Now tap fastboot on top right corner of the screen
19.Once FASTBOOT appears, on computer, goto “2.5.0.1-streak-clockworkrecovery” folder and run “install-recovery-windows.bat”
20.After the screen of shows “done”, hold on to both volume up and down key together until the device boot into recovery mode
21.Select 2nd option, this time, custom recovery memu will appear.
22.Go to update from sd card and update from “update-1.6.0.zip”
23.The device will boot into custom firmware with 2.2 and multi language.
24.The device does not have reception right now because the baseband has to be update.
25.Turn streak off, press hold camera key + power until u see white screen (fastboot)
26.Now tap fastboot on top right corner of the screen
27.Once FASTBOOT appears, on computer, goto “StreakDroid 1.6.0” -> “new baseband” folder and run “flash new baseband-windows.bat”
28.After reboot your device is not up and running (finally…)