There are three ways for you to enjoy Android 4.1 Jelly Bean: wait for official updates, buy an Android device running Android 4.1 Jelly Bean, or flash an Android 4.1 Jelly Bean-based custom ROM.

Waiting for the official updates doesn't look promising, since only a few manufacturers are rumored to release the updates. Buying a new Android device also seems impractical if you still have a fully functional device. This leaves us with the last option: flashing a custom ROM on your Android device.

For Acer Iconia Tab A100 owners, you can get a glimpse of Android 4.1 Jelly Bean on your tablet by flashing the preview build of CyanogenMod 10.

XDA Developers member waydownsouth shares a preview build of CyanogenMod 10 for your Acer Iconia Tab A100. A preview build ROM will let you have a glimpse of how the new update will look like on your tablet but should not be used as a daily driver.

The following are working in the ROM:

• Storage
• Wi-Fi
• Bluetooth
• Camera
• Sounds
• GPS (Hax)
• H/W Rotation Lock
• 2D and 3D acceleration
• HDMI video and audio

If you're itching for the latest updates on your Android tablet, continue reading the rest of this guide and learn how to upgrade the Iconia Tab A100 to Android 4.1.1 Jelly Bean via CyanogenMod 10 custom ROM.

Warning

• The instructions in this guide are intended for use with the Acer Iconia Tab A100. Applying these instructions on another device or model may produce undesired outcomes.
• The information in this guide is provided for instructional and educational purposes only. There is no guarantee that these instructions will work under your specific and unique circumstances.
• Use these instructions at your own risk. We shall not hold any responsibility or liability for whatever happens to you or your device arising from your use of the info in this guide.
• Read and understand the whole guide first before actually performing the instructions.

Requirements

• Acer Iconia Tab A100 with ClockworkMod Recovery installed
• Download the following files:
  • CyanogenMod 10 ROM (cm-10-20120730-UNOFFICIAL-a100.zip, md5sum: 0f704947a50c13172d9607171306fd44)
  • Jelly Bean GApps (Google Apps) Package (gapps-jb-20120717-signed.zip, md5sum: 10988c023495b7871514f2d69cbc2503)
• Backup all personal data on your tablet to make sure you have a copy of your personal data (e.g., contacts, SMS, MMS, Internet settings, Wi-Fi passwords, and the like) in case the procedure in this guide erases such data.
  • For backup tips, check our guides on how to sync your data to the cloud and how to create local backups of your mobile data.

Instructions

1. Copy cm-10-20120730-UNOFFICIAL-a100.zip and gapps-jb-20120717-signed.zipto your tablet's SD card.
2. Turn off your tablet.
3. Reboot your tablet into ClockworkMod Recovery Mode. You can do that by pressing the Volume Up and the Power buttons until Recovery boots.
   • NOTE: Once in Recovery Mode, use the Volume keys to navigate and the Power button to select an option.
4. In case something goes wrong, create a backup of your current ROM. From the main recovery menu, select Backup and Restore and select Backupon the next screen. Wait until recovery finishes backing up your ROM.
5. Go back to the main menu and perform a full wipe:
   • Select Wipe data/factory resetand confirm the action on the next screen.
   • Select Wipe cache partitionand confirm the action on the next screen.
   • Go back to the main menu and select Advanced.From there, select Wipe Dalvik cacheand confirm the action on the next screen.
6. Return to the main menu and select Install ZIP from SD card.
7. Select Choose ZIP from SD cardand select the cm-10-20120730-UNOFFICIAL-a100.zipfile. Confirm the action on the next screen to flash the ROM to your tablet.
8. Go back to the main menu and flash gapps-jb-20120717-signed.zipin the same manner as in steps 6 and 7.
9. Return to the main menu and select Reboot system nowto restart your phone.

Hooray! You have successfully flashed the preview build of CyanogenMod 10 ROM on your Acer Iconia Tab A100.