Let's BackTrack

 How to update HTC One XL (Asia) to Jelly Bean 4.1
           HTC  Sence 4+ with increased RAM 100mb
             [alternetive sollution to-OTA update not installing in HTC One XL]
             

 **There are many user using HTC One XL not able to update their mobile to android
       jelly bean 4.1 & htc sence 4+ instead of getting the update available officially.You 
       have came to the right place to fixed it up & get your mobile updated to the leatest 
        version.

      ```````````````````````````````````````Steps to be followed`````````````````````````````````````
   *First of all you need a rooted phone to install this update.Check my previous 
     post to root your phone..
   *Secondly you have to install/flash CWM recovery in your phone.Full guide to
     flash  CWM  recvry download..

1. Download the zip ROM from here..

2. Copy the downloaded ROM(.zip) to your sd card..

3. Reboot into recovery (under bootloader menu you'll get recovery option)..

4. Erase cache partition,do a factory resset,erase delvik cache..

5. Then choose install zip from sd card & select the downloaded file(.zip)to install

6. Wait for sometime for installing ,it'll take 2-3 minutes..

7. When installation finished Reboot your mobile and enjoy :--

..............Congrats ! you'r now running Jelly bean 4.1.1 HTC Sence 4+..............
  
       ""Do let us know in comments below if you face any 
             difficulty during the procedure mentioned above.
                    We will try our best to sort out the same""     
                           The ROM link is adopted from http://forum.xda-developers.com