asterisk users - Oct 2007 - Thomson ST2030 firmware upgrade

Hello,

I'm trying to upgrade a Thomson ST2030 phone froms its default 1.42 
firmware to the latest version (1.56) through tftp. 

The phone loads the .inf file, then the correct firmware file (as stated 
in the ST2030S.inf), then it reboots and loops doing these same things 
again and again. The firmware version on the phone stays at 1.42.

Is there a special intermediate firmware version to use before going to 
the latest? Something special to include in the .inf file? I looked 
everwhere on the Net (including voip-info).

Thanks,