Bullet5 questions

Gettng the following error running U-Boot Tester.

Error: System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at aredn.Form1.ParseVersion(String ubString)
   at aredn.Form1.btnTest_Click_1(Object sender, EventArgs e)

Ubiquiti Bullet5
software version X55.ar2313.v4.0.4874.110823.1731
AirOS V 4.0
new from E-Bay
Inspection Date 10/20/11

there is no "M" anywhere on it.

Can I go ahead and flash it with the current version of ARDEN?