SystemInfo.deviceUniqueIdentifier changed for many devices

Hello all,
We have urgent and very critical issue in our application.
After we updated our game from Unity 4.5.5 to 4.6.2 many clients has changed their client ids (SystemInfo.deviceUniqueIdentifier):
and many users get the following ID: cd9e459ea708a948d5c2f5a6ca8838cf
this is md5 string from the following:
00000000000000000000000000000000
(32 zeros).
Because of this many people lost their save data (we use client id in keys).
Is there any chance for quick fix to restore SystemInfo.deviceUniqueIdentifier?

List of devices, which lost their id:

    Sony SGP311
    samsung SM-T530
    asus K010
    samsung GT-P5210
    rockchip S7Q
    yifang TAB1004
    Prestigio PMP5670C_DUO
    Acer A1-830
    rockchip MID7109SC
    samsung SM-T310
    Digiin RCT6103W46
    Sony Sony Tablet S
    BOGO LifeStyle 10DCIPS(BO-LF10DCI)