Galaxy Tab 7 was the first to get the Android 4.0 aka ICS and Galaxy Tab 8.9 seems to be the next, takin the lead from Galaxy tab 10.1.
The work on custom ROM has been done by one of the XDA developers.
Note: As one could expect, its buggy but works. Most of the stuff works but camera, 3G, HD & voice search does not work at the moment. But updates would be available soon.
- Your Galaxy Tab 8.9 should be rooted and have Custom recovery like ClockworkMod.
- ROM Manager (Market)
Copy above files to /sdcard directory, after downloading.
How To Install ICS on Galaxy Tab 8.9
Step 1: Open ROM Manager and click Reboot to Recovery.
Step 2. From Recovery, select wipe data / factory reset. Also wipe cache, Dalvik cache.
Step 3: To flash zip from sdcard, choose install zip from sdcard > icyxmas.p5wifi.cwm.alpha1.1.zip.
Once this is flashed, select flash icygappsv2.zip. and when done, reboot.
And you should have Android 4.0.3 Ice Cream Sandwich on your Galaxy Tab 8.9.
Step 4: (optional) You can overclock Galaxy Tab as it runs a modified Kernel. Use SetCPU or Antutu or NoFrills app from market to overclock.
Also check out the official thread on XDA.
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