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.
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:
- Enable ‘Unknown source’ in Settings > Security, then also enable ‘USB debugging’ in Settings > Developer options.
- Download the official Gingerbread stock firmware (6.0.F.0.111), download the firmware here.
- 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.
- 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.