1. misterleoni's Avatar
    Hi guys, this is my first foray into Windows Phone tweaking so if this is a stupid question please go easy on me.

    I picked up a Lumia 620 yesterday for the bargain price of 119.99 plus topup. I'm not an O2 user as such, though I do have a contract SIM that I'm going to be getting the phone unlocked with over the coming days. I hate network customisations though, no matter how subtle and I really want to get rid of that O2 splash screen by flashing a 'stock' ROM. I've looked on Navfirm as per the advice of a friend but there is a baffling array of firmwares on there. I can see mine (RM-846 VAR EU EURO1 GB O2 SL (059R663)) but can't see an obvious UK SIM free ROM to flash.

    Does such a thing exist? My internet is criminally slow so I don't want to download the wrong one and have to start all over again, and also I obviously don't want to brick my phone irreparably.

    As it stands, I have Nokia Care Suite, Navifirm+, all the relevant drivers and a headache.

    Can anyone help, or am I wasting my time at the moment?


    Many thanks in advance
    02-13-2013 06:40 PM
  2. kevinp93's Avatar
    I too have the Lumia 620 on O2 (got one when price was 120 ) and was wondering the same thing...

    Has anyone had luck with debranding it as per instructions above?

    Thanks
    02-15-2013 04:55 AM
  3. misterleoni's Avatar
    I too have the Lumia 620 on O2 (got one when price was 120 ) and was wondering the same thing...

    Has anyone had luck with debranding it as per instructions above?

    Thanks
    I managed to find the generic UK firmware through Navifirm+ it also has the O2 firmware on there. Now running O2 free firmware :)
    02-15-2013 05:16 AM
  4. carloshoodios's Avatar
    I managed to find the generic UK firmware through Navifirm+ it also has the O2 firmware on there. Now running O2 free firmware :)
    Hi misterleoni, I have got Navfirm+ but I have trouble working out which firmware is the right one. Could you give me a clue? :) Thanks
    02-15-2013 07:03 AM
  5. John Bourne's Avatar
    I picked up the 620 on the one day O2 deal and have got O2 to unlock the device so tried de branding it with generic firmware.

    I downloaded the Nokia Care Suite and flashed the generic firmware which put it to stock but it mentioned something about the product code not being specified however it all worked fine but unsure how it would effect software updates in the future.

    The product code is 059R788 which looking at the firmware matches the O2 branded one so will future updates still have to wait for O2 if they are based on product codes? I see the SIM free model and firmware has a product code of 059R4G7.

    For now I have flashed it back to the O2 firmware using the Nokia Care Suite as there are not any updates available to check.
    02-16-2013 10:53 AM
  6. kevinp93's Avatar
    I picked up the 620 on the one day O2 deal and have got O2 to unlock the device so tried de branding it with generic firmware.

    I downloaded the Nokia Care Suite and flashed the generic firmware which put it to stock but it mentioned something about the product code not being specified however it all worked fine but unsure how it would effect software updates in the future.

    The product code is 059R788 which looking at the firmware matches the O2 branded one so will future updates still have to wait for O2 if they are based on product codes? I see the SIM free model and firmware has a product code of 059R4G7.

    For now I have flashed it back to the O2 firmware using the Nokia Care Suite as there are not any updates available to check.
    I read somewhere that "debranding" your handset will re-lock the device... Is your 620 still unlocked, even after flashing it with a different firmware? :) Thanks
    02-17-2013 05:52 AM
  7. John Bourne's Avatar
    Yes the SIM unlock remained even after flashing it with the Nokia Care Suite.
    02-17-2013 07:22 AM
  8. ListenUpGuys's Avatar
    I'm not planning on re-flashing mine because of the problems that can be had with MMS and Internet settings. At least with the O2 firmware I know these are all set-up nicely and can be restored by resetting. The only difference seems to be the first boot screen anyway.
    02-19-2013 06:44 PM
  9. wawilkinson's Avatar
    I can confirm that I bought a 620 on the O2 PAYG (for 120), then unlocked using my wife's pay monthly details (via chat with O2) and now it's de-branded using the '059R4G7 - RM_846_CV_GB_VAR266989_v2_confml_Default' firmware and the phone remained 100% unlocked - I'm now using my work Vodafone SIM.

    I believe you have to use a specific version of the 'Nokia Care Suite' for the firmware flash currently - '2012.45.4.5'.

    I hope that helps!
    02-21-2013 07:38 AM
  10. John Bourne's Avatar
    It will be interesting to know if the product codes not matching between the firmware and the device effects future updates OTA.

    I did flash mine and then flashed it back to the matching O2 version just in case as there was no new updates available to test.
    02-21-2013 07:48 AM
  11. leonkehoe's Avatar
    Other than removing the splash screen and deleting the pre-loaded O2 apps, what else does 'debranding' involve?
    02-22-2013 05:59 AM
  12. MontoP2's Avatar
    Will add another question. Will this de-branding void warranty?
    02-22-2013 11:34 AM
  13. anon(5725119)'s Avatar
    I can confirm that I bought a 620 on the O2 PAYG (for 120), then unlocked using my wife's pay monthly details (via chat with O2) and now it's de-branded using the '059R4G7 - RM_846_CV_GB_VAR266989_v2_confml_Default' firmware and the phone remained 100% unlocked - I'm now using my work Vodafone SIM.

    I believe you have to use a specific version of the 'Nokia Care Suite' for the firmware flash currently - '2012.45.4.5'.

    I hope that helps!
    Hi, I was wondering if you could explain how to do this? I want to unlock my phone too, but I will need to use a friend's details as I don't have an O2 contract.
    02-23-2013 09:01 AM
  14. scruffty's Avatar
    KevinP: a bit arse about face for your answer, but we flashed the phone then unlocked it. all is fine.
    03-07-2013 04:31 AM
  15. scruffty's Avatar
    Hello
    noticed that my flashed Nokia 620 is not updating itself to the latest version using phone update...anyone else got this?
    Thanks!
    04-15-2013 09:36 AM

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