• Table of contents
• SonyEricssonJ120i
  • Specifications
  • Hardware
    • Flash
      • Flash dumps
    • Serial cable
  • Bootloader
  • Stock firmware notes
    • AT Modem mode
    • MMI codes

SonyEricssonJ120i¶

This is another ODM phone model based on TI Calypso. Not yet supported.

Specifications¶

https://www.gsmarena.com/sony_ericsson_j120-1843.php

• GSM 900/1800
• 99 x 44 x 17 mm, 75g
• STN 65k, 96 x 64
• 900mAh Li-Ion battery (BST-37)

Hardware¶

TODO

Flash¶

• INTEL 28F320W18T (1.8 Volt Wireless Flash Memory, 4 MByte)

Flash dumps¶

• https://people.osmocom.org/fixeria/dump/se_j120i/J120i_R1A007_CXC1250845_Main.bin -- firmware, dumped using pstool
• https://people.osmocom.org/fixeria/dump/se_j120i/J120i_R1A007_CXC1250845_full.bin -- full flash, dumped using pstool
• https://people.osmocom.org/fixeria/dump/se_j120i/J120i-R1A007-CXC1250845-356325015955496-fc-full.bin -- full flash, dumped using fc-loadtool
  • https://people.osmocom.org/fixeria/dump/se_j120i/fc_loadtools.patch

Serial cable¶

J120i has the standard Sony Ericsson Fastport connector. Refer to SonyEricssonJ100i for more details.

Bootloader¶

Similarly to Sony Ericsson K200i and unlike Sony Ericsson J100i, J120i has the boot ROM (see CalypsoRomloader) enabled.

Stock firmware notes¶

Below are some notes related to the stock SE's firmware.

AT Modem mode¶

It's not yet known how to get access to the AT command interpreter.
Some AT commands can be found by running strings on the firmware dump.

$ strings J120i_R1A007_CXC1250845_Main.bin | grep "AT[*+]" 

MMI codes¶

NOTE: for some codes you need to press the "green" (call) button.

• Standard SE codes:
  • -> * <- <- * <- * - service info and tests;
  • <- * * <- - lock status;

Found in the firmware dump:

$ strings J120i_R1A007_CXC1250845_Main.bin | less
...
*#06#
F*#**837#
*#**785#
*#**664#
*###664#
*#**364#
*#**364*564#
*#**672#
*#**372#
*#**2263*0#  -- BAND?
*#**2263*1#
*#**2263*2#
*#**2263*3#
*#**2263*4#
*#**735*0#
*#**735*12#
*#**735*13#
*#**833*2#
*#**833*4#
*#**833*7#
*#**833*3#
*#**778377#
*#**464851#
*#**324#
*#**6360#
F*#**6361#
F*#**6362#
F*#**6363#
F*#**6364#
F*#**266*0#
*#**266*1#
*#**277378#  -- ASSERT?
*#**636#
*#**636*0#
*#**636*1#
*#**84637#
*#**767#
*#**3428*0#
*#**3428*1#
*#**3428*2#
*#**778337#
*#**25276#
*#**62683#
*#**3646633*0#
*#**3646633*1#
*#**678257#
*#**33284#  -- DEBUG

https://www.dcode.fr/t9-cipher is quite useful for guessing the purpose.