1. Windows Central Question's Avatar
    Hey,

    I bought O2 Lumia 635, but I want to flash an unbranded ROM so I can get the latest updates.
    Do I need to get the SIM unlocked first?
    How can I flash the new ROM?

    Thank you
    03-21-2015 07:47 AM
  2. xandros9's Avatar
    I don't know the flash procedure, although there are others that do.

    However, you do not need the SIM to be unlocked. I used a guide on here to flash my 920 to the unbranded French ROM about 1 3/4 years ago but its still SIM locked.
    03-26-2015 12:42 AM
  3. EBUK's Avatar
    First off, take a look at this tutorial on XDA:
    [Tutorial] Flash/unbrand Lumia devices - Post #0 - XDA Forums

    I followed it, and flashed my spare L735 from EE with the CV ROM.

    To find the correct product code (needed to download the correct ROM) I used this thread:
    Nokia Product Code Listing for NaviFirm+ Download - (Nokia 730, 735, 830 Added) - GSM-Forum
    03-26-2015 06:53 AM

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