With the recently released Tizen 2.1 Beta you might want to flash it to your reference device. Well here are the instructions to do just that.
lthor RD-PQ-tizen-2.1_20130505.1.tar.gz #Core App Preloaded
lthor RD-PQ-REF-tizen-2.1_20130505.1.tar.gz #Reference App Preloaded
lthor RD-210-tizen-2.1_20130505.1.tar.gz #Core App Preloaded
lthor RD-210-REF-tizen-2.1_20130505.1.tar.gz #Reference App Preloaded
The device will be automatically rebooted after successful installation. Please note that Tizen 2.1 Beta does not contain the hardware acceleration binaries so they must be downloaded and installed manually.
Mali DDK for Tizen 2.1 Beta is available HERE.
Note: Mali DDK in official guide is not compatible with Tizen 2.1 Beta.
If you are unable to connect lthor to the device on Ubuntu (12.10 or 13.04) please follow the instructions to solve the issue.
This error message may occur on start-up if Mali DDK binaries for Tizen 2.0 Magnolia have been installed on Tizen 2.1 Beta. To platform image has to be flashed again to fix the issue.
Source Tizen Wiki