Firmware.

No.  The store only had SagemCom which has more issues.  

At the time I was able to get usa based advance tech rep. They said do not go to store, instead they would send out a replacement . If you go to store they give out whatever they have in stock . If you call then they replace like for like . 

You can call your local store & see what they have.  If they have Arkadyan then go to store & get it replaced same day.  If they have SagemCom then call support & get another Arkadyan. 

Btw, is the sim door cover on your unit hard plastic & difficult to pry open,  or soft rubber & easy to open? 

My first 2 units that got fracked by update had the hard sim cover.  My 3rd unit that still works after update had the soft cover.  Thinking that production run change could be factor in determining if update fracks your unit