I don't know if someone fond this method, but I successful debrand my "W850 Orange France" CID53 like this :

First : Before starting, make a full backup of your data.


This manipulation is at your own risk, neither I nor Top Sony can be held responsible for any mishandling.


Step 1

*note : I'm not 100% sure the CDA top must be the same as the original, but it just appeared logical to me.
I say this because in the custom I chose "Generic_Trade" only two language are available English and the other language of different custom !
  1. Make an Setool2lite Identify. Or Service info menu >*<<*<* Software Info
  2. There is the CDA "CDA102677_11_R11A_ORANGE_F_France" for me.
  3. Go "TopSony Custom Download" and download the custompack "Generic_Trade_****" with the same top CDA, in my case "CDA102677" therefore the file "W850i_CDA102677_6_R4A_Generic_Trade_France".
  4. Decompress the file and rename the customize.xml to customize_upgrade.xml.

Step 2
  1. Launch Far + (JdFlasher).
  2. F11 > just da flasher "db2020" script; port DCU-60; speed 921600.
  3. Connect phone, go to ofs>tpa>preset>custom folder.
  4. copy customize_upgrade.xml in phone
  5. Quit the ofs folder proper ".." enter ".." enter ".." enter ".." until the "warning are you sure?" message, and "yes" finally quit Far
  6. Turn on the phone, wait full start


Step 3

Just start SEUS and fallow instructions. After flashing completed. Turn on the phone >*<<*<* Software info, or make an setool Identify. That's it! Your phone as an generic firmware.