Hello Xavier,
Johan has mentioned what is to my knowledge the final sw version. Last year, I had to order a repair of one of my BLC ´ s and they needed to exchange the electronics completely. So, more or less a new unit, and it says sw is on 1.4.3.19864. You should be careful indeed, and buy only a BLC with the latest sw version. If it is on a lower level sw version, it may be so because of faulty electronics.
The sw versions of the BLC are, from latest to older:
1.4.3.19864 – Final version
1.4.3.19816
1.4.2.19611
1.4.1.19522
Those are the ones I know about.
Kind regards,
Rolf