Question about Sony Ericsson Z550i Cellular Phone

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How would i update my SE z550i's firmware without a USB cable?

I currently have a Sony Ericsson z550i Mobile Phone and I want to update it's firmware. I already have the MBN File (Sony Ericsson Mainware File) but i don't know what to do next. I have already tried copying it to my phone but the file is useless. Any Ideas?

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  • TechMAG14
    TechMAG14 Jan 18, 2009

    Thanks Singh_Shady, now i'm just wondering if there are any other ways of updating it because i can't seem to find my USB cable. I'm going to look for it tommorrow.
    Is there a way without the USB cable? My laptop does have bluetooth.

  • TechMAG14
    TechMAG14 Jan 19, 2009

    Ok, thanks for your help. I'll look for my USB cable later today.

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Hi tech,

firstly: use the seus i.e the sony ericsson update service. its an online free update service by sony. its installation package comes with the phone, ona cd. connect your phone to the pc with the cable and run the soft after installing it. follow the instructions.

secondly: if u want to do it urself, then u ned some third party software like XS++, and some more files known as cust packs, main and fs. the mbn file is not the "firmware" but the "main " of the phone. so its not recommended to "flash" the software at home if u dont have the advanced knowledge about "flashing"... u may brick your phone. (make it permanentally damaged).

u may learn the flashing process from the site: mobilejunkies.net

hope this will help!

Posted on Jan 18, 2009

  • harmeet singh
    harmeet singh Jan 18, 2009

    no tech!! sorry no other way but only with the cable! bluetooth dosnt woks here..

    n i would recommend not updating your firm ware if ur phn is not giving you some problem...

    and if u desperately wanna do it and if your phn is under warranty then u may give it to your nearest service center.. they'll do the job free of cost!


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