Enable 4G LTE on Xperia Ion (AT&T/Rogers) after ICS update

Although not yet officially released by Sony Mobile but Sony Xperia Ion (LT28at/LT28i) users have been able to experience Android 4.0.4 ICS by flashing a leaked official update with Flashtool. Official leaked ICS update is actually for China and not for cell phone that was released in U.S. or Canada, so 4G LTE from at&t or Rogers will not work in any way.


Surely the lack of 4G LTE feature can make users think twice before flashing the leaked update, since some users don’t want to lose ability to download speed up to 42.8 Mbps on their smartphones.

fix 4g lte on xperia ion ics update

Image Credit : Sony Mobile / at&t

Fortunately, there is a solution to restore 4G LTE feature on the Xperia Ion, the following are the steps after you update to a leaked ICS:

  1. Enable ‘Unknown source’ in Settings > Security, then also enable ‘USB debugging’ in Settings > Developer options.
  2. Download the official Gingerbread stock firmware (6.0.F.0.111), download the firmware here.
  3. Flash firmware file above using Bin4ry & Androxyde flashtool, Important!! don’t forget, on ‘Firmware Selection’ window in the Wipe submenu: uncheck all the wipe options, and then for Exclude sub menu: check all except Baseband. If you not familiar with Flashtool, follow common guide how to use the tool to flash Sony firmware.
  4. fix 4g lte on xperia ion

  5. You should getting 4G LTE now, but if you are stuck in 3G you can still activate it by changing Network Preferred. Open phone dialer, input *#*#INFO#*# or *#*#4636#*# Select ‘Phone information’ scroll down until you find the option to change the preferred network, select LTE (preferred) or LTE only.



Filled Under:Tips and Tricks
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5 Responses

  1. kleptic
    May 7, 2013 at 9:32 AMReply

    I know this is old, but it may get some traffic as AT&T is rumored to NOT be releasing JB for the Ion…so users will need to follow similar measures to run a stock international JB rom, and get LTE working on AT&T’s network.

    Your flashtool description is backwards, thats all…

    You need to uncheck EVERYTHING but baseband when flashing from an AT&T rom to an international rom…Your description sets up flash tool to ONLY change the baseband of the phone, and it won’t even flash any of the new rom’s features over in that case. The exclude function of flashtool is what allows you to pick what parts of a particular rom to flash to the phone. Not what parts to keep from the existing rom installed on the phone. when ‘excluding baseband’, you’re simply not flashing the ‘new’ baseband over, and keeping whats already installed. exactly what you want for a non-LTE enabled stock rom.

    lastly…excluding the baseband is only relevant if using an LT28h designated rom. The Chinese LT28h is the only non-LTE enabled Ion, and its stock baseband has no LTE support. If you use LT28i roms, you don’t need to exclude the baseband during flashing. Any LT28at or LT28i stock baseband will work with AT&T, although you may need to manually enter APN settings…AT&T is weird about pushing those to phones on initial boot ups occasionally…

    • nash
      June 8, 2013 at 12:33 PMReply

      Actually the OP was right based on what he intended. You’re also right based on what you’re triying to do. The two situations are different.

    • Joseph Lease
      June 29, 2013 at 7:33 AMReply

      Im a newbie to all of this, is there anyway you can help me update my LT28AT on USA AT&T to Jelly Bean and still have the LTE function. I just want to make sure I know what Im doing, that would really be appreciated. Thank you so much if you have time!

  2. felgriz
    February 27, 2014 at 5:03 PMReply

    not work…

  3. felgriz
    February 27, 2014 at 6:11 PMReply

    no funciona no agarra mas que 3g mi celular

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