Sent from my C6903 using xda app-developers app
Downgrade to .534, root and then upgrade OTA.
Download the file here: (ftf file for .534 firmware)
Use flashtool to downgrade it ( untick wipe data/cache/appslogs )
Then root it with vroot or something else.
Then it will prompt you to download .257, doing do it OTA not through your PC
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