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FW .431 upgrade to .587 and keeping root

Xperia Arc General - xda-developers - forum.xda-developers.com
My phone info:

Model no: LT18i (rooted with CWM installed but with locked boot-loader)

Android v: 4.0.4

Baseband: 2.6.32.9-Perf BuildUser@BuildHost #1

Version: 4.1.B.0.431

I wonder if there's a way to upgrade to the new version .587 without loosing root. From what I understand I will loose root if I update with Pc companion.

In OTA it says PC Companion is required and OTA won't work.

Is there a way to flash some file in CWM or flash-tool even though my bootloader is locked?


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