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After spending hours looking for a similar case on the web, I was really close to contact the after sale service. Desperatly, I made a last search on this forum and found this post : http://www.sonyalphaforum.com/topic/594-firmware-update-121-for-a7m2rs6000/ It was the key to my problem. So I decided to share it with you, because there is not a word about this on internet. Basically, I was trying to update my SEL2870 from 0.01 to 0.02 with a Sony A7II 1.20 firmware. I did follow precisely the instruction and try it on Windows and Mac (no memory card, battery full, ext previously install on OSX 10.10). No matter what I was trying, the update process never start on my sony A7II (ILCE-7M2 for keywords). The update process always get stuck on " Follow computer instructions " (" Suivre les instructions sur l'ordinateur ", french keywords, sorry for my english). Until I found out that I should previously install the A7II firmware update 1.21 (only available on sony japan website since april ?!). Installing this update was the solution to get the lens update working as we could guess in the following google translation : "In the body software ver1.20, software updates of the lens body I was fixed symptoms that do not start." Yes, it's written 1.20 by sony instead of 1.20, it should be a typo. Now you know what to do. Of course, I'm not responsible for any trouble during the update, and you should carefully follow the instruction otherwise it's the best way to brick your loving camera. And many thanks to @kasimodem for keeping up updated of this firmware update and for including a google translation of the changelog.