Ok, I tried and it's a nightmare. The first 1.bin uploaded successfully, but on 2.bin I had the same error message. I did another factory reset and now I'm stucked on the init page and when I click "Try it now", I get a 500 internal error. No way to go ahead and use the router anymore. I was able to login with ssh but it's not a great help at the moment. Any idea how to unlock my router ?