I have an 'American' 8820 with 4.2.2.169 (Platform 2.4.067).
I have Desktop Manager 4.3 installed, and it has communicated with my 8820. I downloaded and installed the new (Chinese) OS version, deleted the .xml file, re-connected the BB, started BBDM and it does not prompt me to update the device.
What am I doing wrong? Does it have anything to do with Chinese vs English or US?