Your getting that error because of qa flag. Rogero 3.55 v3.7 is spoofed that is why it shows 4.21. It is just a number the 4.40 same as rebug says 999, nothing to worry about. Make sure there are no discs in your PS3, install toggle_qa, then run it without any USB drives connected
Check with combo button selection while highlighting Network Settings. If you want to make sure QA flag was set, go to "Network Settings" then apply the following key combo (all at the same time):
L1 + L2 + L3 (press left stick) + R1 + R2 + dpad_down
You should see Edy Viewer, Debug Settings, and Install Package Files if done correctly.
Then install OFW 3.55, and then you should be able to update to Rogero 4.30 v2.03 in XMB