Android 2.2 on Rooted Nexus With Stock ROM

I have a Nexus One and I rooted it to get Arabic to work, which it did but only for SMS. The letters were broken for other things.

To get an official ROM to work, it has to verify that your current system is indeed an official release and it is the exact previous update/release.

I had to restore back the original ERE27 files that I replaced to get Arabic to work:

• DroidSansFallback.ttf: 4caeadd734f4be9973163bdf02ea6cf5 (md5sum)
• libskiagl.so: 1b5cedd01b14838320956bea94b0fe97
• libskia.so: cc692fb57efb199045c720de491cc3cf
• libwebcore.so: c8b9931ec8771a720497d5197cd1a108

But that wasn't enough, because rooting the phone modifies the boot partition of the phone which is also checked by updates.

Guides on the Internet were all about using a custom recovery image, wiping user data and doing some other unnecessary things. All what is needed is to flash the original boot image again:

• boot.img: 36a29d765387dd69cde89367def51dda
• ERE27 stock ROM (2.1-update1): 90700607c04279716b505aa203e9c684

To flash the boot image, you need the Android SDK  to get the USB drivers for the phone working, but you should already know that since you already rooted the phone. Painfully long steps can be found here (Windows).

Files you'll need from Android ERE27 (2.1-update1):

• Original / stock font & libs
• Original / stock boot.img
• Fastboot utility
• The new Froyo update (Android 2.2) named as update.zip (put it on your sdcard) 

You can download the stock ERE27 font, libs, boot.img and fastboot from me here.

Steps:

1. Enable USB debugging on the phone: Menu -> Settings -> Applications -> Development -> USB debugging
2. Turn off the phone and connect the USB cable
3. Hold the trackball, press the power button
4. Using fastboot, open a shell/command line and type: fastboot flash boot boot.img
   You should see something like this:
   sending 'boot' (2560 KB)... OKAY
   writing 'boot'... OKAY
5. Then type: fastboot reboot-bootloader to reboot the phone into the bootloader screen
6. To navigate use the volume up/down buttons & to select press the power button once
7. Select BootLoader then Recovery
8. The screen will go black for a while then you'll see a Droid with an exclamation mark. Press volume up & power at the same time
9. In the new menu, use volume up/down to navigate then Trackball to select
10. Select apply sdcard:update.zip
11. Now it'll verify your system files and partitions then start patching then deploying new files
12. The phone will reboot 3 times to unpack multiple updates
13. Enjoy your new toy

The files that I've linked are hosted on my Google account. I've taken them from official releases. Feel free to compare the md5 hashes.

Enhancements that I noticed in Android 2.2:

• Exchange calendars now sync
• Trackball was flashing blue for Facebook updates & white for emails
• The phone now can tether using USB or act as a wireless access point
• Notifications have new funny icons
• Flash 10.1 from Adobe (go to adobe's website then click on Get Flash Player)
• Call log groups calls from a single contact (like in SMS)
• In the market, you can enable application auto-update
• In the market, there's a button to Update All apps
• The on-screen menu button now has 2 more brothers: browser & phone, so you can delete the icons from the desk/screen
• In GTalk, clicking menu gives you the signout option (no need to click more)
• I noticed a Twitter app
• Faster camera response on the display
• More camera options: Focus, Exposure, Zoom, ...etc.
• Arabic font builtin but it looks weird and the letters are broken (unconnected)
• 170-250 MB free RAM rather than the previous 40-60MB free RAM!!!